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Finding the Fourth Proportional to 158,428.13, 218,630.82 and 86,810.87

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Solution

The fourth proportional to 158,428.13, 218,630.82 and 86,810.87 is: 119,799.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,428.13 : 218,630.82 = 86,810.87 : x
  2. Step 2: Convert to fraction form
    158,428.13/218,630.82 = 86,810.87/x
  3. Step 3: Cross multiply
    158,428.13x = 218,630.82 × 86,810.87
  4. Step 4: Simplify right side
    158,428.13x = 18,979,530,599.86
  5. Step 5: Solve for x
    x = 18,979,530,599.86/158,428.13
  6. Step 6: Final answer
    x = 119,799.00

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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.