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Finding the Fourth Proportional to 891.57, 1,230.35 and 498.60

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Solution

The fourth proportional to 891.57, 1,230.35 and 498.60 is: 688.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.57 : 1,230.35 = 498.60 : x
  2. Step 2: Convert to fraction form
    891.57/1,230.35 = 498.60/x
  3. Step 3: Cross multiply
    891.57x = 1,230.35 × 498.60
  4. Step 4: Simplify right side
    891.57x = 613,443.87
  5. Step 5: Solve for x
    x = 613,443.87/891.57
  6. Step 6: Final answer
    x = 688.05

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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.