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Finding the Fourth Proportional to 656.61, 985.25 and 425.44

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Solution

The fourth proportional to 656.61, 985.25 and 425.44 is: 638.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.61 : 985.25 = 425.44 : x
  2. Step 2: Convert to fraction form
    656.61/985.25 = 425.44/x
  3. Step 3: Cross multiply
    656.61x = 985.25 × 425.44
  4. Step 4: Simplify right side
    656.61x = 419,159.83
  5. Step 5: Solve for x
    x = 419,159.83/656.61
  6. Step 6: Final answer
    x = 638.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.