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Finding the Fourth Proportional to 528.53, 728.21 and 353.57

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Solution

The fourth proportional to 528.53, 728.21 and 353.57 is: 487.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.53 : 728.21 = 353.57 : x
  2. Step 2: Convert to fraction form
    528.53/728.21 = 353.57/x
  3. Step 3: Cross multiply
    528.53x = 728.21 × 353.57
  4. Step 4: Simplify right side
    528.53x = 257,470.45
  5. Step 5: Solve for x
    x = 257,470.45/528.53
  6. Step 6: Final answer
    x = 487.15

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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.