Home / 1,126.20-1,689.30-432.90

Finding the Fourth Proportional to 1,126.20, 1,689.30 and 432.90

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Solution

The fourth proportional to 1,126.20, 1,689.30 and 432.90 is: 649.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.20 : 1,689.30 = 432.90 : x
  2. Step 2: Convert to fraction form
    1,126.20/1,689.30 = 432.90/x
  3. Step 3: Cross multiply
    1,126.20x = 1,689.30 × 432.90
  4. Step 4: Simplify right side
    1,126.20x = 731,297.97
  5. Step 5: Solve for x
    x = 731,297.97/1,126.20
  6. Step 6: Final answer
    x = 649.35

Related Problems

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Double scale
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Similar ratio
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1.5x scale

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.