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Finding the Fourth Proportional to 86,585.70, 129,769.20 and 42,116.70

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Solution

The fourth proportional to 86,585.70, 129,769.20 and 42,116.70 is: 63,121.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,585.70 : 129,769.20 = 42,116.70 : x
  2. Step 2: Convert to fraction form
    86,585.70/129,769.20 = 42,116.70/x
  3. Step 3: Cross multiply
    86,585.70x = 129,769.20 × 42,116.70
  4. Step 4: Simplify right side
    86,585.70x = 5,465,450,465.64
  5. Step 5: Solve for x
    x = 5,465,450,465.64/86,585.70
  6. Step 6: Final answer
    x = 63,121.86

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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.