Home / 90,989.61-136,561.10-38,436.81

Finding the Fourth Proportional to 90,989.61, 136,561.10 and 38,436.81

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Solution

The fourth proportional to 90,989.61, 136,561.10 and 38,436.81 is: 57,687.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,989.61 : 136,561.10 = 38,436.81 : x
  2. Step 2: Convert to fraction form
    90,989.61/136,561.10 = 38,436.81/x
  3. Step 3: Cross multiply
    90,989.61x = 136,561.10 × 38,436.81
  4. Step 4: Simplify right side
    90,989.61x = 5,248,972,861.91
  5. Step 5: Solve for x
    x = 5,248,972,861.91/90,989.61
  6. Step 6: Final answer
    x = 57,687.61

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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.