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Finding the Fourth Proportional to 155,695.09, 214,859.88 and 87,712.88

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Solution

The fourth proportional to 155,695.09, 214,859.88 and 87,712.88 is: 121,044.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,695.09 : 214,859.88 = 87,712.88 : x
  2. Step 2: Convert to fraction form
    155,695.09/214,859.88 = 87,712.88/x
  3. Step 3: Cross multiply
    155,695.09x = 214,859.88 × 87,712.88
  4. Step 4: Simplify right side
    155,695.09x = 18,845,979,401.61
  5. Step 5: Solve for x
    x = 18,845,979,401.61/155,695.09
  6. Step 6: Final answer
    x = 121,044.15

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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.