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Finding the Fourth Proportional to 500.72, 690.78 and 353.48

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Solution

The fourth proportional to 500.72, 690.78 and 353.48 is: 487.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.72 : 690.78 = 353.48 : x
  2. Step 2: Convert to fraction form
    500.72/690.78 = 353.48/x
  3. Step 3: Cross multiply
    500.72x = 690.78 × 353.48
  4. Step 4: Simplify right side
    500.72x = 244,176.91
  5. Step 5: Solve for x
    x = 244,176.91/500.72
  6. Step 6: Final answer
    x = 487.65

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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.