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Finding the Fourth Proportional to 1,972.80, 2,957.28 and 817.44

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Solution

The fourth proportional to 1,972.80, 2,957.28 and 817.44 is: 1,225.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,972.80 : 2,957.28 = 817.44 : x
  2. Step 2: Convert to fraction form
    1,972.80/2,957.28 = 817.44/x
  3. Step 3: Cross multiply
    1,972.80x = 2,957.28 × 817.44
  4. Step 4: Simplify right side
    1,972.80x = 2,417,398.96
  5. Step 5: Solve for x
    x = 2,417,398.96/1,972.80
  6. Step 6: Final answer
    x = 1,225.36

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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.