Home / 1,020.78-1,531.20-443.64

Finding the Fourth Proportional to 1,020.78, 1,531.20 and 443.64

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Solution

The fourth proportional to 1,020.78, 1,531.20 and 443.64 is: 665.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.78 : 1,531.20 = 443.64 : x
  2. Step 2: Convert to fraction form
    1,020.78/1,531.20 = 443.64/x
  3. Step 3: Cross multiply
    1,020.78x = 1,531.20 × 443.64
  4. Step 4: Simplify right side
    1,020.78x = 679,301.57
  5. Step 5: Solve for x
    x = 679,301.57/1,020.78
  6. Step 6: Final answer
    x = 665.47

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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.