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Finding the Fourth Proportional to 657.55, 907.40 and 358.78

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Solution

The fourth proportional to 657.55, 907.40 and 358.78 is: 495.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.55 : 907.40 = 358.78 : x
  2. Step 2: Convert to fraction form
    657.55/907.40 = 358.78/x
  3. Step 3: Cross multiply
    657.55x = 907.40 × 358.78
  4. Step 4: Simplify right side
    657.55x = 325,557.30
  5. Step 5: Solve for x
    x = 325,557.30/657.55
  6. Step 6: Final answer
    x = 495.11

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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.