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Finding the Fourth Proportional to 891.96, 1,230.78 and 499

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Solution

The fourth proportional to 891.96, 1,230.78 and 499 is: 688.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.96 : 1,230.78 = 499 : x
  2. Step 2: Convert to fraction form
    891.96/1,230.78 = 499/x
  3. Step 3: Cross multiply
    891.96x = 1,230.78 × 499
  4. Step 4: Simplify right side
    891.96x = 614,159.22
  5. Step 5: Solve for x
    x = 614,159.22/891.96
  6. Step 6: Final answer
    x = 688.55

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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.