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Finding the Fourth Proportional to 89,303.40, 133,695.90 and 86,711.40

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Solution

The fourth proportional to 89,303.40, 133,695.90 and 86,711.40 is: 129,815.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,303.40 : 133,695.90 = 86,711.40 : x
  2. Step 2: Convert to fraction form
    89,303.40/133,695.90 = 86,711.40/x
  3. Step 3: Cross multiply
    89,303.40x = 133,695.90 × 86,711.40
  4. Step 4: Simplify right side
    89,303.40x = 11,592,958,663.26
  5. Step 5: Solve for x
    x = 11,592,958,663.26/89,303.40
  6. Step 6: Final answer
    x = 129,815.42

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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.