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Finding the Fourth Proportional to 657.78, 907.92 and 395.88

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Solution

The fourth proportional to 657.78, 907.92 and 395.88 is: 546.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.78 : 907.92 = 395.88 : x
  2. Step 2: Convert to fraction form
    657.78/907.92 = 395.88/x
  3. Step 3: Cross multiply
    657.78x = 907.92 × 395.88
  4. Step 4: Simplify right side
    657.78x = 359,427.37
  5. Step 5: Solve for x
    x = 359,427.37/657.78
  6. Step 6: Final answer
    x = 546.42

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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.