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Finding the Fourth Proportional to 657.40, 986.40 and 349.18

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Solution

The fourth proportional to 657.40, 986.40 and 349.18 is: 523.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.40 : 986.40 = 349.18 : x
  2. Step 2: Convert to fraction form
    657.40/986.40 = 349.18/x
  3. Step 3: Cross multiply
    657.40x = 986.40 × 349.18
  4. Step 4: Simplify right side
    657.40x = 344,431.15
  5. Step 5: Solve for x
    x = 344,431.15/657.40
  6. Step 6: Final answer
    x = 523.93

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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.