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Finding the Fourth Proportional to 528.80, 728.89 and 423.71

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Solution

The fourth proportional to 528.80, 728.89 and 423.71 is: 584.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.80 : 728.89 = 423.71 : x
  2. Step 2: Convert to fraction form
    528.80/728.89 = 423.71/x
  3. Step 3: Cross multiply
    528.80x = 728.89 × 423.71
  4. Step 4: Simplify right side
    528.80x = 308,837.98
  5. Step 5: Solve for x
    x = 308,837.98/528.80
  6. Step 6: Final answer
    x = 584.04

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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.