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Finding the Fourth Proportional to 879.74, 1,214.61 and 548.30

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Solution

The fourth proportional to 879.74, 1,214.61 and 548.30 is: 757.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.74 : 1,214.61 = 548.30 : x
  2. Step 2: Convert to fraction form
    879.74/1,214.61 = 548.30/x
  3. Step 3: Cross multiply
    879.74x = 1,214.61 × 548.30
  4. Step 4: Simplify right side
    879.74x = 665,970.66
  5. Step 5: Solve for x
    x = 665,970.66/879.74
  6. Step 6: Final answer
    x = 757.01

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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.