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Finding the Fourth Proportional to 921.89, 1,272.15 and 548.90

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Solution

The fourth proportional to 921.89, 1,272.15 and 548.90 is: 757.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.89 : 1,272.15 = 548.90 : x
  2. Step 2: Convert to fraction form
    921.89/1,272.15 = 548.90/x
  3. Step 3: Cross multiply
    921.89x = 1,272.15 × 548.90
  4. Step 4: Simplify right side
    921.89x = 698,283.14
  5. Step 5: Solve for x
    x = 698,283.14/921.89
  6. Step 6: Final answer
    x = 757.45

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Double scale
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1.5x scale

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.