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Finding the Fourth Proportional to 880.74, 1,215.11 and 548.90

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Solution

The fourth proportional to 880.74, 1,215.11 and 548.90 is: 757.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.74 : 1,215.11 = 548.90 : x
  2. Step 2: Convert to fraction form
    880.74/1,215.11 = 548.90/x
  3. Step 3: Cross multiply
    880.74x = 1,215.11 × 548.90
  4. Step 4: Simplify right side
    880.74x = 666,965.06
  5. Step 5: Solve for x
    x = 666,965.06/880.74
  6. Step 6: Final answer
    x = 757.28

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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.