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Finding the Fourth Proportional to 87,987.96, 121,423.32 and 47,703

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Solution

The fourth proportional to 87,987.96, 121,423.32 and 47,703 is: 65,830.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,987.96 : 121,423.32 = 47,703 : x
  2. Step 2: Convert to fraction form
    87,987.96/121,423.32 = 47,703/x
  3. Step 3: Cross multiply
    87,987.96x = 121,423.32 × 47,703
  4. Step 4: Simplify right side
    87,987.96x = 5,792,256,633.96
  5. Step 5: Solve for x
    x = 5,792,256,633.96/87,987.96
  6. Step 6: Final answer
    x = 65,830.10

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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.