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Finding the Fourth Proportional to 621.37, 857.79 and 425.90

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Solution

The fourth proportional to 621.37, 857.79 and 425.90 is: 587.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.37 : 857.79 = 425.90 : x
  2. Step 2: Convert to fraction form
    621.37/857.79 = 425.90/x
  3. Step 3: Cross multiply
    621.37x = 857.79 × 425.90
  4. Step 4: Simplify right side
    621.37x = 365,332.76
  5. Step 5: Solve for x
    x = 365,332.76/621.37
  6. Step 6: Final answer
    x = 587.95

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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.