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Finding the Fourth Proportional to 28,318.80, 39,080.95 and 15,572.95

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Solution

The fourth proportional to 28,318.80, 39,080.95 and 15,572.95 is: 21,491.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,318.80 : 39,080.95 = 15,572.95 : x
  2. Step 2: Convert to fraction form
    28,318.80/39,080.95 = 15,572.95/x
  3. Step 3: Cross multiply
    28,318.80x = 39,080.95 × 15,572.95
  4. Step 4: Simplify right side
    28,318.80x = 608,605,680.30
  5. Step 5: Solve for x
    x = 608,605,680.30/28,318.80
  6. Step 6: Final answer
    x = 21,491.22

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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.