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Finding the Fourth Proportional to 28,920.90, 39,915.10 and 18,311.52

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Solution

The fourth proportional to 28,920.90, 39,915.10 and 18,311.52 is: 25,272.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,920.90 : 39,915.10 = 18,311.52 : x
  2. Step 2: Convert to fraction form
    28,920.90/39,915.10 = 18,311.52/x
  3. Step 3: Cross multiply
    28,920.90x = 39,915.10 × 18,311.52
  4. Step 4: Simplify right side
    28,920.90x = 730,906,151.95
  5. Step 5: Solve for x
    x = 730,906,151.95/28,920.90
  6. Step 6: Final answer
    x = 25,272.59

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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.