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Finding the Fourth Proportional to 86,013.60, 129,020.40 and 68,298.90

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Solution

The fourth proportional to 86,013.60, 129,020.40 and 68,298.90 is: 102,448.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,013.60 : 129,020.40 = 68,298.90 : x
  2. Step 2: Convert to fraction form
    86,013.60/129,020.40 = 68,298.90/x
  3. Step 3: Cross multiply
    86,013.60x = 129,020.40 × 68,298.90
  4. Step 4: Simplify right side
    86,013.60x = 8,811,951,397.56
  5. Step 5: Solve for x
    x = 8,811,951,397.56/86,013.60
  6. Step 6: Final answer
    x = 102,448.35

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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.