Home / 28,490.78-39,318.10-15,915.26

Finding the Fourth Proportional to 28,490.78, 39,318.10 and 15,915.26

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Solution

The fourth proportional to 28,490.78, 39,318.10 and 15,915.26 is: 21,963.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,490.78 : 39,318.10 = 15,915.26 : x
  2. Step 2: Convert to fraction form
    28,490.78/39,318.10 = 15,915.26/x
  3. Step 3: Cross multiply
    28,490.78x = 39,318.10 × 15,915.26
  4. Step 4: Simplify right side
    28,490.78x = 625,757,784.21
  5. Step 5: Solve for x
    x = 625,757,784.21/28,490.78
  6. Step 6: Final answer
    x = 21,963.52

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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.