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Finding the Fourth Proportional to 981.48, 1,353.86 and 687.46

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Solution

The fourth proportional to 981.48, 1,353.86 and 687.46 is: 948.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.48 : 1,353.86 = 687.46 : x
  2. Step 2: Convert to fraction form
    981.48/1,353.86 = 687.46/x
  3. Step 3: Cross multiply
    981.48x = 1,353.86 × 687.46
  4. Step 4: Simplify right side
    981.48x = 930,724.60
  5. Step 5: Solve for x
    x = 930,724.60/981.48
  6. Step 6: Final answer
    x = 948.29

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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.