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Finding the Fourth Proportional to 621.54, 857.86 and 425.52

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Solution

The fourth proportional to 621.54, 857.86 and 425.52 is: 587.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.54 : 857.86 = 425.52 : x
  2. Step 2: Convert to fraction form
    621.54/857.86 = 425.52/x
  3. Step 3: Cross multiply
    621.54x = 857.86 × 425.52
  4. Step 4: Simplify right side
    621.54x = 365,036.59
  5. Step 5: Solve for x
    x = 365,036.59/621.54
  6. Step 6: Final answer
    x = 587.31

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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.