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Finding the Fourth Proportional to 922.15, 1,272.36 and 549.28

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Solution

The fourth proportional to 922.15, 1,272.36 and 549.28 is: 757.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.15 : 1,272.36 = 549.28 : x
  2. Step 2: Convert to fraction form
    922.15/1,272.36 = 549.28/x
  3. Step 3: Cross multiply
    922.15x = 1,272.36 × 549.28
  4. Step 4: Simplify right side
    922.15x = 698,882.46
  5. Step 5: Solve for x
    x = 698,882.46/922.15
  6. Step 6: Final answer
    x = 757.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.