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Finding the Fourth Proportional to 158,490.98, 218,717.10 and 86,870.78

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Solution

The fourth proportional to 158,490.98, 218,717.10 and 86,870.78 is: 119,881.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,490.98 : 218,717.10 = 86,870.78 : x
  2. Step 2: Convert to fraction form
    158,490.98/218,717.10 = 86,870.78/x
  3. Step 3: Cross multiply
    158,490.98x = 218,717.10 × 86,870.78
  4. Step 4: Simplify right side
    158,490.98x = 19,000,125,623.13
  5. Step 5: Solve for x
    x = 19,000,125,623.13/158,490.98
  6. Step 6: Final answer
    x = 119,881.43

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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.