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Finding the Fourth Proportional to 1,342.88, 2,015.28 and 477.20

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Solution

The fourth proportional to 1,342.88, 2,015.28 and 477.20 is: 716.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,342.88 : 2,015.28 = 477.20 : x
  2. Step 2: Convert to fraction form
    1,342.88/2,015.28 = 477.20/x
  3. Step 3: Cross multiply
    1,342.88x = 2,015.28 × 477.20
  4. Step 4: Simplify right side
    1,342.88x = 961,691.62
  5. Step 5: Solve for x
    x = 961,691.62/1,342.88
  6. Step 6: Final answer
    x = 716.14

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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.