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Finding the Fourth Proportional to 28,159.01, 42,250.25 and 12,355.87

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Solution

The fourth proportional to 28,159.01, 42,250.25 and 12,355.87 is: 18,538.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,159.01 : 42,250.25 = 12,355.87 : x
  2. Step 2: Convert to fraction form
    28,159.01/42,250.25 = 12,355.87/x
  3. Step 3: Cross multiply
    28,159.01x = 42,250.25 × 12,355.87
  4. Step 4: Simplify right side
    28,159.01x = 522,038,680.17
  5. Step 5: Solve for x
    x = 522,038,680.17/28,159.01
  6. Step 6: Final answer
    x = 18,538.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.