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Finding the Fourth Proportional to 158,505.90, 218,743.75 and 86,885.90

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Solution

The fourth proportional to 158,505.90, 218,743.75 and 86,885.90 is: 119,905.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,505.90 : 218,743.75 = 86,885.90 : x
  2. Step 2: Convert to fraction form
    158,505.90/218,743.75 = 86,885.90/x
  3. Step 3: Cross multiply
    158,505.90x = 218,743.75 × 86,885.90
  4. Step 4: Simplify right side
    158,505.90x = 19,005,747,153.70
  5. Step 5: Solve for x
    x = 19,005,747,153.70/158,505.90
  6. Step 6: Final answer
    x = 119,905.61

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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.