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Finding the Fourth Proportional to 657.94, 987.42 and 247.45

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Solution

The fourth proportional to 657.94, 987.42 and 247.45 is: 371.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.94 : 987.42 = 247.45 : x
  2. Step 2: Convert to fraction form
    657.94/987.42 = 247.45/x
  3. Step 3: Cross multiply
    657.94x = 987.42 × 247.45
  4. Step 4: Simplify right side
    657.94x = 244,337.08
  5. Step 5: Solve for x
    x = 244,337.08/657.94
  6. Step 6: Final answer
    x = 371.37

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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.