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Finding the Fourth Proportional to 1,521.91, 2,282.19 and 644.28

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Solution

The fourth proportional to 1,521.91, 2,282.19 and 644.28 is: 966.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,521.91 : 2,282.19 = 644.28 : x
  2. Step 2: Convert to fraction form
    1,521.91/2,282.19 = 644.28/x
  3. Step 3: Cross multiply
    1,521.91x = 2,282.19 × 644.28
  4. Step 4: Simplify right side
    1,521.91x = 1,470,369.37
  5. Step 5: Solve for x
    x = 1,470,369.37/1,521.91
  6. Step 6: Final answer
    x = 966.13

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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.