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Finding the Fourth Proportional to 103,129.20, 154,693.80 and 90,663.30

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Solution

The fourth proportional to 103,129.20, 154,693.80 and 90,663.30 is: 135,994.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,129.20 : 154,693.80 = 90,663.30 : x
  2. Step 2: Convert to fraction form
    103,129.20/154,693.80 = 90,663.30/x
  3. Step 3: Cross multiply
    103,129.20x = 154,693.80 × 90,663.30
  4. Step 4: Simplify right side
    103,129.20x = 14,025,050,397.54
  5. Step 5: Solve for x
    x = 14,025,050,397.54/103,129.20
  6. Step 6: Final answer
    x = 135,994.95

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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.