Home / 21,679.87-29,921.40-12,732.28

Finding the Fourth Proportional to 21,679.87, 29,921.40 and 12,732.28

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Solution

The fourth proportional to 21,679.87, 29,921.40 and 12,732.28 is: 17,572.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,679.87 : 29,921.40 = 12,732.28 : x
  2. Step 2: Convert to fraction form
    21,679.87/29,921.40 = 12,732.28/x
  3. Step 3: Cross multiply
    21,679.87x = 29,921.40 × 12,732.28
  4. Step 4: Simplify right side
    21,679.87x = 380,967,642.79
  5. Step 5: Solve for x
    x = 380,967,642.79/21,679.87
  6. Step 6: Final answer
    x = 17,572.41

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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.