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Finding the Fourth Proportional to 1,521.78, 2,282.97 and 644.28

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Solution

The fourth proportional to 1,521.78, 2,282.97 and 644.28 is: 966.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,521.78 : 2,282.97 = 644.28 : x
  2. Step 2: Convert to fraction form
    1,521.78/2,282.97 = 644.28/x
  3. Step 3: Cross multiply
    1,521.78x = 2,282.97 × 644.28
  4. Step 4: Simplify right side
    1,521.78x = 1,470,871.91
  5. Step 5: Solve for x
    x = 1,470,871.91/1,521.78
  6. Step 6: Final answer
    x = 966.55

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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.