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Finding the Fourth Proportional to 86,421.80, 129,632.70 and 73,737.20

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Solution

The fourth proportional to 86,421.80, 129,632.70 and 73,737.20 is: 110,605.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,421.80 : 129,632.70 = 73,737.20 : x
  2. Step 2: Convert to fraction form
    86,421.80/129,632.70 = 73,737.20/x
  3. Step 3: Cross multiply
    86,421.80x = 129,632.70 × 73,737.20
  4. Step 4: Simplify right side
    86,421.80x = 9,558,752,326.44
  5. Step 5: Solve for x
    x = 9,558,752,326.44/86,421.80
  6. Step 6: Final answer
    x = 110,605.80

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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.