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Finding the Fourth Proportional to 86,731.56, 129,740.94 and 69,235.56

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Solution

The fourth proportional to 86,731.56, 129,740.94 and 69,235.56 is: 103,568.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,731.56 : 129,740.94 = 69,235.56 : x
  2. Step 2: Convert to fraction form
    86,731.56/129,740.94 = 69,235.56/x
  3. Step 3: Cross multiply
    86,731.56x = 129,740.94 × 69,235.56
  4. Step 4: Simplify right side
    86,731.56x = 8,982,686,635.83
  5. Step 5: Solve for x
    x = 8,982,686,635.83/86,731.56
  6. Step 6: Final answer
    x = 103,568.84

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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.