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Finding the Fourth Proportional to 921.93, 1,272.18 and 549.03

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Solution

The fourth proportional to 921.93, 1,272.18 and 549.03 is: 757.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.93 : 1,272.18 = 549.03 : x
  2. Step 2: Convert to fraction form
    921.93/1,272.18 = 549.03/x
  3. Step 3: Cross multiply
    921.93x = 1,272.18 × 549.03
  4. Step 4: Simplify right side
    921.93x = 698,464.99
  5. Step 5: Solve for x
    x = 698,464.99/921.93
  6. Step 6: Final answer
    x = 757.61

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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.