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Finding the Fourth Proportional to 1,320.31, 1,821.72 and 760.60

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Solution

The fourth proportional to 1,320.31, 1,821.72 and 760.60 is: 1,049.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.31 : 1,821.72 = 760.60 : x
  2. Step 2: Convert to fraction form
    1,320.31/1,821.72 = 760.60/x
  3. Step 3: Cross multiply
    1,320.31x = 1,821.72 × 760.60
  4. Step 4: Simplify right side
    1,320.31x = 1,385,600.23
  5. Step 5: Solve for x
    x = 1,385,600.23/1,320.31
  6. Step 6: Final answer
    x = 1,049.45

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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.