Home / 21,438.74-29,569.19-18,781.53

Finding the Fourth Proportional to 21,438.74, 29,569.19 and 18,781.53

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Solution

The fourth proportional to 21,438.74, 29,569.19 and 18,781.53 is: 25,904.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,438.74 : 29,569.19 = 18,781.53 : x
  2. Step 2: Convert to fraction form
    21,438.74/29,569.19 = 18,781.53/x
  3. Step 3: Cross multiply
    21,438.74x = 29,569.19 × 18,781.53
  4. Step 4: Simplify right side
    21,438.74x = 555,354,535.15
  5. Step 5: Solve for x
    x = 555,354,535.15/21,438.74
  6. Step 6: Final answer
    x = 25,904.26

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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.