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Finding the Fourth Proportional to 891.59, 1,230.66 and 625.91

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Solution

The fourth proportional to 891.59, 1,230.66 and 625.91 is: 863.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.59 : 1,230.66 = 625.91 : x
  2. Step 2: Convert to fraction form
    891.59/1,230.66 = 625.91/x
  3. Step 3: Cross multiply
    891.59x = 1,230.66 × 625.91
  4. Step 4: Simplify right side
    891.59x = 770,276.25
  5. Step 5: Solve for x
    x = 770,276.25/891.59
  6. Step 6: Final answer
    x = 863.94

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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.