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Finding the Fourth Proportional to 891.60, 1,230.40 and 493.29

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Solution

The fourth proportional to 891.60, 1,230.40 and 493.29 is: 680.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.60 : 1,230.40 = 493.29 : x
  2. Step 2: Convert to fraction form
    891.60/1,230.40 = 493.29/x
  3. Step 3: Cross multiply
    891.60x = 1,230.40 × 493.29
  4. Step 4: Simplify right side
    891.60x = 606,944.02
  5. Step 5: Solve for x
    x = 606,944.02/891.60
  6. Step 6: Final answer
    x = 680.74

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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.