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Finding the Fourth Proportional to 621.86, 858.11 and 373.18

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Solution

The fourth proportional to 621.86, 858.11 and 373.18 is: 514.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.86 : 858.11 = 373.18 : x
  2. Step 2: Convert to fraction form
    621.86/858.11 = 373.18/x
  3. Step 3: Cross multiply
    621.86x = 858.11 × 373.18
  4. Step 4: Simplify right side
    621.86x = 320,229.49
  5. Step 5: Solve for x
    x = 320,229.49/621.86
  6. Step 6: Final answer
    x = 514.95

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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.