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Finding the Fourth Proportional to 1,073.28, 1,615.61 and 767.28

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Solution

The fourth proportional to 1,073.28, 1,615.61 and 767.28 is: 1,154.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,073.28 : 1,615.61 = 767.28 : x
  2. Step 2: Convert to fraction form
    1,073.28/1,615.61 = 767.28/x
  3. Step 3: Cross multiply
    1,073.28x = 1,615.61 × 767.28
  4. Step 4: Simplify right side
    1,073.28x = 1,239,625.24
  5. Step 5: Solve for x
    x = 1,239,625.24/1,073.28
  6. Step 6: Final answer
    x = 1,154.99

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.