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Finding the Fourth Proportional to 90,520, 135,780.24 and 28,190.56

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Solution

The fourth proportional to 90,520, 135,780.24 and 28,190.56 is: 42,285.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,520 : 135,780.24 = 28,190.56 : x
  2. Step 2: Convert to fraction form
    90,520/135,780.24 = 28,190.56/x
  3. Step 3: Cross multiply
    90,520x = 135,780.24 × 28,190.56
  4. Step 4: Simplify right side
    90,520x = 3,827,721,002.53
  5. Step 5: Solve for x
    x = 3,827,721,002.53/90,520
  6. Step 6: Final answer
    x = 42,285.91

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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.