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Finding the Fourth Proportional to 124,035.61, 185,905.79 and 86,391.88

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Solution

The fourth proportional to 124,035.61, 185,905.79 and 86,391.88 is: 129,485.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,035.61 : 185,905.79 = 86,391.88 : x
  2. Step 2: Convert to fraction form
    124,035.61/185,905.79 = 86,391.88/x
  3. Step 3: Cross multiply
    124,035.61x = 185,905.79 × 86,391.88
  4. Step 4: Simplify right side
    124,035.61x = 16,060,750,700.99
  5. Step 5: Solve for x
    x = 16,060,750,700.99/124,035.61
  6. Step 6: Final answer
    x = 129,485.00

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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.