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Finding the Fourth Proportional to 218,859.29, 328,436.66 and 85,723.03

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Solution

The fourth proportional to 218,859.29, 328,436.66 and 85,723.03 is: 128,642.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,859.29 : 328,436.66 = 85,723.03 : x
  2. Step 2: Convert to fraction form
    218,859.29/328,436.66 = 85,723.03/x
  3. Step 3: Cross multiply
    218,859.29x = 328,436.66 × 85,723.03
  4. Step 4: Simplify right side
    218,859.29x = 28,154,585,658.28
  5. Step 5: Solve for x
    x = 28,154,585,658.28/218,859.29
  6. Step 6: Final answer
    x = 128,642.41

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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.