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Finding the Fourth Proportional to 981.20, 1,355.28 and 926.48

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Solution

The fourth proportional to 981.20, 1,355.28 and 926.48 is: 1,279.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.20 : 1,355.28 = 926.48 : x
  2. Step 2: Convert to fraction form
    981.20/1,355.28 = 926.48/x
  3. Step 3: Cross multiply
    981.20x = 1,355.28 × 926.48
  4. Step 4: Simplify right side
    981.20x = 1,255,639.81
  5. Step 5: Solve for x
    x = 1,255,639.81/981.20
  6. Step 6: Final answer
    x = 1,279.70

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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.