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Finding the Fourth Proportional to 981.20, 1,327.50 and 981.20

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Solution

The fourth proportional to 981.20, 1,327.50 and 981.20 is: 1,327.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.20 : 1,327.50 = 981.20 : x
  2. Step 2: Convert to fraction form
    981.20/1,327.50 = 981.20/x
  3. Step 3: Cross multiply
    981.20x = 1,327.50 × 981.20
  4. Step 4: Simplify right side
    981.20x = 1,302,543
  5. Step 5: Solve for x
    x = 1,302,543/981.20
  6. Step 6: Final answer
    x = 1,327.50

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.