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Finding the Fourth Proportional to 891.68, 1,230.49 and 518.65

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Solution

The fourth proportional to 891.68, 1,230.49 and 518.65 is: 715.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.68 : 1,230.49 = 518.65 : x
  2. Step 2: Convert to fraction form
    891.68/1,230.49 = 518.65/x
  3. Step 3: Cross multiply
    891.68x = 1,230.49 × 518.65
  4. Step 4: Simplify right side
    891.68x = 638,193.64
  5. Step 5: Solve for x
    x = 638,193.64/891.68
  6. Step 6: Final answer
    x = 715.72

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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.