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Finding the Fourth Proportional to 657.90, 907.83 and 378.21

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Solution

The fourth proportional to 657.90, 907.83 and 378.21 is: 521.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.90 : 907.83 = 378.21 : x
  2. Step 2: Convert to fraction form
    657.90/907.83 = 378.21/x
  3. Step 3: Cross multiply
    657.90x = 907.83 × 378.21
  4. Step 4: Simplify right side
    657.90x = 343,350.38
  5. Step 5: Solve for x
    x = 343,350.38/657.90
  6. Step 6: Final answer
    x = 521.89

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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.