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Finding the Fourth Proportional to 1,321.76, 1,981.20 and 671.06

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Solution

The fourth proportional to 1,321.76, 1,981.20 and 671.06 is: 1,005.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.76 : 1,981.20 = 671.06 : x
  2. Step 2: Convert to fraction form
    1,321.76/1,981.20 = 671.06/x
  3. Step 3: Cross multiply
    1,321.76x = 1,981.20 × 671.06
  4. Step 4: Simplify right side
    1,321.76x = 1,329,504.07
  5. Step 5: Solve for x
    x = 1,329,504.07/1,321.76
  6. Step 6: Final answer
    x = 1,005.86

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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.