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Finding the Fourth Proportional to 656.76, 985.48 and 425.59

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Solution

The fourth proportional to 656.76, 985.48 and 425.59 is: 638.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.76 : 985.48 = 425.59 : x
  2. Step 2: Convert to fraction form
    656.76/985.48 = 425.59/x
  3. Step 3: Cross multiply
    656.76x = 985.48 × 425.59
  4. Step 4: Simplify right side
    656.76x = 419,412.03
  5. Step 5: Solve for x
    x = 419,412.03/656.76
  6. Step 6: Final answer
    x = 638.61

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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.