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Finding the Fourth Proportional to 891.26, 1,230.12 and 498.31

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Solution

The fourth proportional to 891.26, 1,230.12 and 498.31 is: 687.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.26 : 1,230.12 = 498.31 : x
  2. Step 2: Convert to fraction form
    891.26/1,230.12 = 498.31/x
  3. Step 3: Cross multiply
    891.26x = 1,230.12 × 498.31
  4. Step 4: Simplify right side
    891.26x = 612,981.10
  5. Step 5: Solve for x
    x = 612,981.10/891.26
  6. Step 6: Final answer
    x = 687.77

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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.