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Finding the Fourth Proportional to 657.74, 985.79 and 310.61

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Solution

The fourth proportional to 657.74, 985.79 and 310.61 is: 465.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.74 : 985.79 = 310.61 : x
  2. Step 2: Convert to fraction form
    657.74/985.79 = 310.61/x
  3. Step 3: Cross multiply
    657.74x = 985.79 × 310.61
  4. Step 4: Simplify right side
    657.74x = 306,189.75
  5. Step 5: Solve for x
    x = 306,189.75/657.74
  6. Step 6: Final answer
    x = 465.52

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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.