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Finding the Fourth Proportional to 762.18, 1,143.28 and 275.28

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Solution

The fourth proportional to 762.18, 1,143.28 and 275.28 is: 412.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.18 : 1,143.28 = 275.28 : x
  2. Step 2: Convert to fraction form
    762.18/1,143.28 = 275.28/x
  3. Step 3: Cross multiply
    762.18x = 1,143.28 × 275.28
  4. Step 4: Simplify right side
    762.18x = 314,722.12
  5. Step 5: Solve for x
    x = 314,722.12/762.18
  6. Step 6: Final answer
    x = 412.92

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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.