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Finding the Fourth Proportional to 657.79, 987.26 and 349.87

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Solution

The fourth proportional to 657.79, 987.26 and 349.87 is: 525.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.79 : 987.26 = 349.87 : x
  2. Step 2: Convert to fraction form
    657.79/987.26 = 349.87/x
  3. Step 3: Cross multiply
    657.79x = 987.26 × 349.87
  4. Step 4: Simplify right side
    657.79x = 345,412.66
  5. Step 5: Solve for x
    x = 345,412.66/657.79
  6. Step 6: Final answer
    x = 525.11

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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.