Home / 1,128.24-1,691.28-434.40

Finding the Fourth Proportional to 1,128.24, 1,691.28 and 434.40

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Solution

The fourth proportional to 1,128.24, 1,691.28 and 434.40 is: 651.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.24 : 1,691.28 = 434.40 : x
  2. Step 2: Convert to fraction form
    1,128.24/1,691.28 = 434.40/x
  3. Step 3: Cross multiply
    1,128.24x = 1,691.28 × 434.40
  4. Step 4: Simplify right side
    1,128.24x = 734,692.03
  5. Step 5: Solve for x
    x = 734,692.03/1,128.24
  6. Step 6: Final answer
    x = 651.18

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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.