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Finding the Fourth Proportional to 86,520.30, 129,780.45 and 71,940.30

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Solution

The fourth proportional to 86,520.30, 129,780.45 and 71,940.30 is: 107,910.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,520.30 : 129,780.45 = 71,940.30 : x
  2. Step 2: Convert to fraction form
    86,520.30/129,780.45 = 71,940.30/x
  3. Step 3: Cross multiply
    86,520.30x = 129,780.45 × 71,940.30
  4. Step 4: Simplify right side
    86,520.30x = 9,336,444,507.14
  5. Step 5: Solve for x
    x = 9,336,444,507.14/86,520.30
  6. Step 6: Final answer
    x = 107,910.45

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1.5x scale

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.