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Finding the Fourth Proportional to 657.12, 906.92 and 395.28

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Solution

The fourth proportional to 657.12, 906.92 and 395.28 is: 545.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.12 : 906.92 = 395.28 : x
  2. Step 2: Convert to fraction form
    657.12/906.92 = 395.28/x
  3. Step 3: Cross multiply
    657.12x = 906.92 × 395.28
  4. Step 4: Simplify right side
    657.12x = 358,487.34
  5. Step 5: Solve for x
    x = 358,487.34/657.12
  6. Step 6: Final answer
    x = 545.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.