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Finding the Fourth Proportional to 657.68, 986.49 and 442.62

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Solution

The fourth proportional to 657.68, 986.49 and 442.62 is: 663.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.68 : 986.49 = 442.62 : x
  2. Step 2: Convert to fraction form
    657.68/986.49 = 442.62/x
  3. Step 3: Cross multiply
    657.68x = 986.49 × 442.62
  4. Step 4: Simplify right side
    657.68x = 436,640.20
  5. Step 5: Solve for x
    x = 436,640.20/657.68
  6. Step 6: Final answer
    x = 663.91

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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.