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Finding the Fourth Proportional to 218,888.33, 328,138.70 and 85,864.05

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Solution

The fourth proportional to 218,888.33, 328,138.70 and 85,864.05 is: 128,720.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,888.33 : 328,138.70 = 85,864.05 : x
  2. Step 2: Convert to fraction form
    218,888.33/328,138.70 = 85,864.05/x
  3. Step 3: Cross multiply
    218,888.33x = 328,138.70 × 85,864.05
  4. Step 4: Simplify right side
    218,888.33x = 28,175,317,314.41
  5. Step 5: Solve for x
    x = 28,175,317,314.41/218,888.33
  6. Step 6: Final answer
    x = 128,720.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.