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Finding the Fourth Proportional to 1,320.47, 1,981.39 and 671.20

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Solution

The fourth proportional to 1,320.47, 1,981.39 and 671.20 is: 1,007.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.47 : 1,981.39 = 671.20 : x
  2. Step 2: Convert to fraction form
    1,320.47/1,981.39 = 671.20/x
  3. Step 3: Cross multiply
    1,320.47x = 1,981.39 × 671.20
  4. Step 4: Simplify right side
    1,320.47x = 1,329,912.85
  5. Step 5: Solve for x
    x = 1,329,912.85/1,320.47
  6. Step 6: Final answer
    x = 1,007.15

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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.