Home / 21,278.79-29,363.49-15,637.23

Finding the Fourth Proportional to 21,278.79, 29,363.49 and 15,637.23

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Solution

The fourth proportional to 21,278.79, 29,363.49 and 15,637.23 is: 21,578.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.79 : 29,363.49 = 15,637.23 : x
  2. Step 2: Convert to fraction form
    21,278.79/29,363.49 = 15,637.23/x
  3. Step 3: Cross multiply
    21,278.79x = 29,363.49 × 15,637.23
  4. Step 4: Simplify right side
    21,278.79x = 459,163,646.73
  5. Step 5: Solve for x
    x = 459,163,646.73/21,278.79
  6. Step 6: Final answer
    x = 21,578.47

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Half scale
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Double scale
Find fourth proportional to 21,279.79, 29,364.87 and 15,638.23
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.