Home / 1,126.32-1,689.42-432.96

Finding the Fourth Proportional to 1,126.32, 1,689.42 and 432.96

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Solution

The fourth proportional to 1,126.32, 1,689.42 and 432.96 is: 649.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.32 : 1,689.42 = 432.96 : x
  2. Step 2: Convert to fraction form
    1,126.32/1,689.42 = 432.96/x
  3. Step 3: Cross multiply
    1,126.32x = 1,689.42 × 432.96
  4. Step 4: Simplify right side
    1,126.32x = 731,451.28
  5. Step 5: Solve for x
    x = 731,451.28/1,126.32
  6. Step 6: Final answer
    x = 649.42

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Double scale
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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.