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Finding the Fourth Proportional to 1,321.07, 1,981.80 and 772.97

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Solution

The fourth proportional to 1,321.07, 1,981.80 and 772.97 is: 1,159.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.07 : 1,981.80 = 772.97 : x
  2. Step 2: Convert to fraction form
    1,321.07/1,981.80 = 772.97/x
  3. Step 3: Cross multiply
    1,321.07x = 1,981.80 × 772.97
  4. Step 4: Simplify right side
    1,321.07x = 1,531,862.04
  5. Step 5: Solve for x
    x = 1,531,862.04/1,321.07
  6. Step 6: Final answer
    x = 1,159.57

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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.