Home / 1,521.20-2,282.70-643.66

Finding the Fourth Proportional to 1,521.20, 2,282.70 and 643.66

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Solution

The fourth proportional to 1,521.20, 2,282.70 and 643.66 is: 965.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,521.20 : 2,282.70 = 643.66 : x
  2. Step 2: Convert to fraction form
    1,521.20/2,282.70 = 643.66/x
  3. Step 3: Cross multiply
    1,521.20x = 2,282.70 × 643.66
  4. Step 4: Simplify right side
    1,521.20x = 1,469,279.39
  5. Step 5: Solve for x
    x = 1,469,279.39/1,521.20
  6. Step 6: Final answer
    x = 965.87

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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.