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Finding the Fourth Proportional to 921.98, 1,272.15 and 549.29

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Solution

The fourth proportional to 921.98, 1,272.15 and 549.29 is: 757.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.98 : 1,272.15 = 549.29 : x
  2. Step 2: Convert to fraction form
    921.98/1,272.15 = 549.29/x
  3. Step 3: Cross multiply
    921.98x = 1,272.15 × 549.29
  4. Step 4: Simplify right side
    921.98x = 698,772.91
  5. Step 5: Solve for x
    x = 698,772.91/921.98
  6. Step 6: Final answer
    x = 757.91

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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.