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Finding the Fourth Proportional to 402.93, 556.61 and 387.95

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Solution

The fourth proportional to 402.93, 556.61 and 387.95 is: 535.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.93 : 556.61 = 387.95 : x
  2. Step 2: Convert to fraction form
    402.93/556.61 = 387.95/x
  3. Step 3: Cross multiply
    402.93x = 556.61 × 387.95
  4. Step 4: Simplify right side
    402.93x = 215,932.13
  5. Step 5: Solve for x
    x = 215,932.13/402.93
  6. Step 6: Final answer
    x = 535.90

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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.