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Finding the Fourth Proportional to 86,710.80, 129,920.40 and 71,839.20

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Solution

The fourth proportional to 86,710.80, 129,920.40 and 71,839.20 is: 107,638.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,710.80 : 129,920.40 = 71,839.20 : x
  2. Step 2: Convert to fraction form
    86,710.80/129,920.40 = 71,839.20/x
  3. Step 3: Cross multiply
    86,710.80x = 129,920.40 × 71,839.20
  4. Step 4: Simplify right side
    86,710.80x = 9,333,377,599.68
  5. Step 5: Solve for x
    x = 9,333,377,599.68/86,710.80
  6. Step 6: Final answer
    x = 107,638.01

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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.