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Finding the Fourth Proportional to 879.70, 1,214.56 and 548.58

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Solution

The fourth proportional to 879.70, 1,214.56 and 548.58 is: 757.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.70 : 1,214.56 = 548.58 : x
  2. Step 2: Convert to fraction form
    879.70/1,214.56 = 548.58/x
  3. Step 3: Cross multiply
    879.70x = 1,214.56 × 548.58
  4. Step 4: Simplify right side
    879.70x = 666,283.32
  5. Step 5: Solve for x
    x = 666,283.32/879.70
  6. Step 6: Final answer
    x = 757.40

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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.