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Finding the Fourth Proportional to 891.85, 1,230.72 and 498.88

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Solution

The fourth proportional to 891.85, 1,230.72 and 498.88 is: 688.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.85 : 1,230.72 = 498.88 : x
  2. Step 2: Convert to fraction form
    891.85/1,230.72 = 498.88/x
  3. Step 3: Cross multiply
    891.85x = 1,230.72 × 498.88
  4. Step 4: Simplify right side
    891.85x = 613,981.59
  5. Step 5: Solve for x
    x = 613,981.59/891.85
  6. Step 6: Final answer
    x = 688.44

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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.