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Finding the Fourth Proportional to 981.44, 1,353.60 and 951.36

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Solution

The fourth proportional to 981.44, 1,353.60 and 951.36 is: 1,312.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.44 : 1,353.60 = 951.36 : x
  2. Step 2: Convert to fraction form
    981.44/1,353.60 = 951.36/x
  3. Step 3: Cross multiply
    981.44x = 1,353.60 × 951.36
  4. Step 4: Simplify right side
    981.44x = 1,287,760.90
  5. Step 5: Solve for x
    x = 1,287,760.90/981.44
  6. Step 6: Final answer
    x = 1,312.11

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1.5x scale

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.