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Finding the Fourth Proportional to 86,565.60, 129,848.40 and 81,316.80

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Solution

The fourth proportional to 86,565.60, 129,848.40 and 81,316.80 is: 121,975.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,565.60 : 129,848.40 = 81,316.80 : x
  2. Step 2: Convert to fraction form
    86,565.60/129,848.40 = 81,316.80/x
  3. Step 3: Cross multiply
    86,565.60x = 129,848.40 × 81,316.80
  4. Step 4: Simplify right side
    86,565.60x = 10,558,856,373.12
  5. Step 5: Solve for x
    x = 10,558,856,373.12/86,565.60
  6. Step 6: Final answer
    x = 121,975.20

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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.