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Finding the Fourth Proportional to 966.78, 1,448.24 and 720.74

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Solution

The fourth proportional to 966.78, 1,448.24 and 720.74 is: 1,079.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    966.78 : 1,448.24 = 720.74 : x
  2. Step 2: Convert to fraction form
    966.78/1,448.24 = 720.74/x
  3. Step 3: Cross multiply
    966.78x = 1,448.24 × 720.74
  4. Step 4: Simplify right side
    966.78x = 1,043,809.92
  5. Step 5: Solve for x
    x = 1,043,809.92/966.78
  6. Step 6: Final answer
    x = 1,079.68

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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.