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Finding the Fourth Proportional to 891.80, 1,228.56 and 625.74

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Solution

The fourth proportional to 891.80, 1,228.56 and 625.74 is: 862.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.80 : 1,228.56 = 625.74 : x
  2. Step 2: Convert to fraction form
    891.80/1,228.56 = 625.74/x
  3. Step 3: Cross multiply
    891.80x = 1,228.56 × 625.74
  4. Step 4: Simplify right side
    891.80x = 768,759.13
  5. Step 5: Solve for x
    x = 768,759.13/891.80
  6. Step 6: Final answer
    x = 862.03

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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.