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Finding the Fourth Proportional to 87,671.90, 120,987.17 and 47,385.67

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Solution

The fourth proportional to 87,671.90, 120,987.17 and 47,385.67 is: 65,392.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,671.90 : 120,987.17 = 47,385.67 : x
  2. Step 2: Convert to fraction form
    87,671.90/120,987.17 = 47,385.67/x
  3. Step 3: Cross multiply
    87,671.90x = 120,987.17 × 47,385.67
  4. Step 4: Simplify right side
    87,671.90x = 5,733,057,776.62
  5. Step 5: Solve for x
    x = 5,733,057,776.62/87,671.90
  6. Step 6: Final answer
    x = 65,392.19

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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.