Home / 1,385.12-2,077.68-411.20

Finding the Fourth Proportional to 1,385.12, 2,077.68 and 411.20

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Solution

The fourth proportional to 1,385.12, 2,077.68 and 411.20 is: 616.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.12 : 2,077.68 = 411.20 : x
  2. Step 2: Convert to fraction form
    1,385.12/2,077.68 = 411.20/x
  3. Step 3: Cross multiply
    1,385.12x = 2,077.68 × 411.20
  4. Step 4: Simplify right side
    1,385.12x = 854,342.02
  5. Step 5: Solve for x
    x = 854,342.02/1,385.12
  6. Step 6: Final answer
    x = 616.80

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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.