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Finding the Fourth Proportional to 621.60, 857.77 and 372.87

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Solution

The fourth proportional to 621.60, 857.77 and 372.87 is: 514.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.60 : 857.77 = 372.87 : x
  2. Step 2: Convert to fraction form
    621.60/857.77 = 372.87/x
  3. Step 3: Cross multiply
    621.60x = 857.77 × 372.87
  4. Step 4: Simplify right side
    621.60x = 319,830.55
  5. Step 5: Solve for x
    x = 319,830.55/621.60
  6. Step 6: Final answer
    x = 514.53

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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.