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Finding the Fourth Proportional to 87,765.87, 121,116.78 and 47,479.53

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Solution

The fourth proportional to 87,765.87, 121,116.78 and 47,479.53 is: 65,521.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,765.87 : 121,116.78 = 47,479.53 : x
  2. Step 2: Convert to fraction form
    87,765.87/121,116.78 = 47,479.53/x
  3. Step 3: Cross multiply
    87,765.87x = 121,116.78 × 47,479.53
  4. Step 4: Simplify right side
    87,765.87x = 5,750,567,789.51
  5. Step 5: Solve for x
    x = 5,750,567,789.51/87,765.87
  6. Step 6: Final answer
    x = 65,521.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.