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Finding the Fourth Proportional to 86,651.70, 129,977.55 and 47,285.70

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Solution

The fourth proportional to 86,651.70, 129,977.55 and 47,285.70 is: 70,928.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,651.70 : 129,977.55 = 47,285.70 : x
  2. Step 2: Convert to fraction form
    86,651.70/129,977.55 = 47,285.70/x
  3. Step 3: Cross multiply
    86,651.70x = 129,977.55 × 47,285.70
  4. Step 4: Simplify right side
    86,651.70x = 6,146,079,436.04
  5. Step 5: Solve for x
    x = 6,146,079,436.04/86,651.70
  6. Step 6: Final answer
    x = 70,928.55

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Similar ratio
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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.