Home / 1,042.20-1,439.10-711.72

Finding the Fourth Proportional to 1,042.20, 1,439.10 and 711.72

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Solution

The fourth proportional to 1,042.20, 1,439.10 and 711.72 is: 982.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.20 : 1,439.10 = 711.72 : x
  2. Step 2: Convert to fraction form
    1,042.20/1,439.10 = 711.72/x
  3. Step 3: Cross multiply
    1,042.20x = 1,439.10 × 711.72
  4. Step 4: Simplify right side
    1,042.20x = 1,024,236.25
  5. Step 5: Solve for x
    x = 1,024,236.25/1,042.20
  6. Step 6: Final answer
    x = 982.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.