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Finding the Fourth Proportional to 86,439.80, 129,708.88 and 69,020.33

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Solution

The fourth proportional to 86,439.80, 129,708.88 and 69,020.33 is: 103,569.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,439.80 : 129,708.88 = 69,020.33 : x
  2. Step 2: Convert to fraction form
    86,439.80/129,708.88 = 69,020.33/x
  3. Step 3: Cross multiply
    86,439.80x = 129,708.88 × 69,020.33
  4. Step 4: Simplify right side
    86,439.80x = 8,952,548,880.44
  5. Step 5: Solve for x
    x = 8,952,548,880.44/86,439.80
  6. Step 6: Final answer
    x = 103,569.76

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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.