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Finding the Fourth Proportional to 898.20, 1,347.30 and 281.90

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Solution

The fourth proportional to 898.20, 1,347.30 and 281.90 is: 422.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.20 : 1,347.30 = 281.90 : x
  2. Step 2: Convert to fraction form
    898.20/1,347.30 = 281.90/x
  3. Step 3: Cross multiply
    898.20x = 1,347.30 × 281.90
  4. Step 4: Simplify right side
    898.20x = 379,803.87
  5. Step 5: Solve for x
    x = 379,803.87/898.20
  6. Step 6: Final answer
    x = 422.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.