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Finding the Fourth Proportional to 86,586.60, 129,879.90 and 47,123.40

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Solution

The fourth proportional to 86,586.60, 129,879.90 and 47,123.40 is: 70,685.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,586.60 : 129,879.90 = 47,123.40 : x
  2. Step 2: Convert to fraction form
    86,586.60/129,879.90 = 47,123.40/x
  3. Step 3: Cross multiply
    86,586.60x = 129,879.90 × 47,123.40
  4. Step 4: Simplify right side
    86,586.60x = 6,120,382,479.66
  5. Step 5: Solve for x
    x = 6,120,382,479.66/86,586.60
  6. Step 6: Final answer
    x = 70,685.10

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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.