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Finding the Fourth Proportional to 657.88, 985.74 and 383.92

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Solution

The fourth proportional to 657.88, 985.74 and 383.92 is: 575.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.88 : 985.74 = 383.92 : x
  2. Step 2: Convert to fraction form
    657.88/985.74 = 383.92/x
  3. Step 3: Cross multiply
    657.88x = 985.74 × 383.92
  4. Step 4: Simplify right side
    657.88x = 378,445.30
  5. Step 5: Solve for x
    x = 378,445.30/657.88
  6. Step 6: Final answer
    x = 575.25

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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.