Home / 21,278.97-29,366.19-12,783.69

Finding the Fourth Proportional to 21,278.97, 29,366.19 and 12,783.69

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Solution

The fourth proportional to 21,278.97, 29,366.19 and 12,783.69 is: 17,642.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.97 : 29,366.19 = 12,783.69 : x
  2. Step 2: Convert to fraction form
    21,278.97/29,366.19 = 12,783.69/x
  3. Step 3: Cross multiply
    21,278.97x = 29,366.19 × 12,783.69
  4. Step 4: Simplify right side
    21,278.97x = 375,408,269.44
  5. Step 5: Solve for x
    x = 375,408,269.44/21,278.97
  6. Step 6: Final answer
    x = 17,642.22

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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.