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Finding the Fourth Proportional to 89,262.40, 133,634.40 and 86,670.40

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Solution

The fourth proportional to 89,262.40, 133,634.40 and 86,670.40 is: 129,753.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,262.40 : 133,634.40 = 86,670.40 : x
  2. Step 2: Convert to fraction form
    89,262.40/133,634.40 = 86,670.40/x
  3. Step 3: Cross multiply
    89,262.40x = 133,634.40 × 86,670.40
  4. Step 4: Simplify right side
    89,262.40x = 11,582,146,901.76
  5. Step 5: Solve for x
    x = 11,582,146,901.76/89,262.40
  6. Step 6: Final answer
    x = 129,753.93

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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.