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Finding the Fourth Proportional to 688, 948.96 and 425.56

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Solution

The fourth proportional to 688, 948.96 and 425.56 is: 586.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    688 : 948.96 = 425.56 : x
  2. Step 2: Convert to fraction form
    688/948.96 = 425.56/x
  3. Step 3: Cross multiply
    688x = 948.96 × 425.56
  4. Step 4: Simplify right side
    688x = 403,839.42
  5. Step 5: Solve for x
    x = 403,839.42/688
  6. Step 6: Final answer
    x = 586.98

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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.