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Finding the Fourth Proportional to 86,989.92, 130,391.60 and 56,992.83

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Solution

The fourth proportional to 86,989.92, 130,391.60 and 56,992.83 is: 85,428.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,989.92 : 130,391.60 = 56,992.83 : x
  2. Step 2: Convert to fraction form
    86,989.92/130,391.60 = 56,992.83/x
  3. Step 3: Cross multiply
    86,989.92x = 130,391.60 × 56,992.83
  4. Step 4: Simplify right side
    86,989.92x = 7,431,385,861.95
  5. Step 5: Solve for x
    x = 7,431,385,861.95/86,989.92
  6. Step 6: Final answer
    x = 85,428.12

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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.