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Finding the Fourth Proportional to 1,281.12, 1,920.96 and 415.20

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Solution

The fourth proportional to 1,281.12, 1,920.96 and 415.20 is: 622.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.12 : 1,920.96 = 415.20 : x
  2. Step 2: Convert to fraction form
    1,281.12/1,920.96 = 415.20/x
  3. Step 3: Cross multiply
    1,281.12x = 1,920.96 × 415.20
  4. Step 4: Simplify right side
    1,281.12x = 797,582.59
  5. Step 5: Solve for x
    x = 797,582.59/1,281.12
  6. Step 6: Final answer
    x = 622.57

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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.