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Finding the Fourth Proportional to 891.89, 1,230.81 and 493.56

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Solution

The fourth proportional to 891.89, 1,230.81 and 493.56 is: 681.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.89 : 1,230.81 = 493.56 : x
  2. Step 2: Convert to fraction form
    891.89/1,230.81 = 493.56/x
  3. Step 3: Cross multiply
    891.89x = 1,230.81 × 493.56
  4. Step 4: Simplify right side
    891.89x = 607,475.36
  5. Step 5: Solve for x
    x = 607,475.36/891.89
  6. Step 6: Final answer
    x = 681.11

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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.