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Finding the Fourth Proportional to 621.54, 858.18 and 400.61

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Solution

The fourth proportional to 621.54, 858.18 and 400.61 is: 553.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.54 : 858.18 = 400.61 : x
  2. Step 2: Convert to fraction form
    621.54/858.18 = 400.61/x
  3. Step 3: Cross multiply
    621.54x = 858.18 × 400.61
  4. Step 4: Simplify right side
    621.54x = 343,791.20
  5. Step 5: Solve for x
    x = 343,791.20/621.54
  6. Step 6: Final answer
    x = 553.13

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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.