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Finding the Fourth Proportional to 86,580.80, 129,871.20 and 72,000.80

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Solution

The fourth proportional to 86,580.80, 129,871.20 and 72,000.80 is: 108,001.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,580.80 : 129,871.20 = 72,000.80 : x
  2. Step 2: Convert to fraction form
    86,580.80/129,871.20 = 72,000.80/x
  3. Step 3: Cross multiply
    86,580.80x = 129,871.20 × 72,000.80
  4. Step 4: Simplify right side
    86,580.80x = 9,350,830,296.96
  5. Step 5: Solve for x
    x = 9,350,830,296.96/86,580.80
  6. Step 6: Final answer
    x = 108,001.20

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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.