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Finding the Fourth Proportional to 948.38, 1,423.28 and 717.56

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Solution

The fourth proportional to 948.38, 1,423.28 and 717.56 is: 1,076.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.38 : 1,423.28 = 717.56 : x
  2. Step 2: Convert to fraction form
    948.38/1,423.28 = 717.56/x
  3. Step 3: Cross multiply
    948.38x = 1,423.28 × 717.56
  4. Step 4: Simplify right side
    948.38x = 1,021,285.21
  5. Step 5: Solve for x
    x = 1,021,285.21/948.38
  6. Step 6: Final answer
    x = 1,076.87

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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.