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Finding the Fourth Proportional to 657.60, 907.32 and 408.90

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Solution

The fourth proportional to 657.60, 907.32 and 408.90 is: 564.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.60 : 907.32 = 408.90 : x
  2. Step 2: Convert to fraction form
    657.60/907.32 = 408.90/x
  3. Step 3: Cross multiply
    657.60x = 907.32 × 408.90
  4. Step 4: Simplify right side
    657.60x = 371,003.15
  5. Step 5: Solve for x
    x = 371,003.15/657.60
  6. Step 6: Final answer
    x = 564.18

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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.