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Finding the Fourth Proportional to 90,709.60, 136,044.96 and 28,372

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Solution

The fourth proportional to 90,709.60, 136,044.96 and 28,372 is: 42,551.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,709.60 : 136,044.96 = 28,372 : x
  2. Step 2: Convert to fraction form
    90,709.60/136,044.96 = 28,372/x
  3. Step 3: Cross multiply
    90,709.60x = 136,044.96 × 28,372
  4. Step 4: Simplify right side
    90,709.60x = 3,859,867,605.12
  5. Step 5: Solve for x
    x = 3,859,867,605.12/90,709.60
  6. Step 6: Final answer
    x = 42,551.92

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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.