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Finding the Fourth Proportional to 28,806, 39,752.30 and 15,558

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Solution

The fourth proportional to 28,806, 39,752.30 and 15,558 is: 21,470.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,806 : 39,752.30 = 15,558 : x
  2. Step 2: Convert to fraction form
    28,806/39,752.30 = 15,558/x
  3. Step 3: Cross multiply
    28,806x = 39,752.30 × 15,558
  4. Step 4: Simplify right side
    28,806x = 618,466,205.61
  5. Step 5: Solve for x
    x = 618,466,205.61/28,806
  6. Step 6: Final answer
    x = 21,470.05

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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.