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Finding the Fourth Proportional to 657.40, 987.45 and 634.45

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Solution

The fourth proportional to 657.40, 987.45 and 634.45 is: 952.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.40 : 987.45 = 634.45 : x
  2. Step 2: Convert to fraction form
    657.40/987.45 = 634.45/x
  3. Step 3: Cross multiply
    657.40x = 987.45 × 634.45
  4. Step 4: Simplify right side
    657.40x = 626,487.65
  5. Step 5: Solve for x
    x = 626,487.65/657.40
  6. Step 6: Final answer
    x = 952.98

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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.