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Finding the Fourth Proportional to 853.55, 1,280.02 and 298.11

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Solution

The fourth proportional to 853.55, 1,280.02 and 298.11 is: 447.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.55 : 1,280.02 = 298.11 : x
  2. Step 2: Convert to fraction form
    853.55/1,280.02 = 298.11/x
  3. Step 3: Cross multiply
    853.55x = 1,280.02 × 298.11
  4. Step 4: Simplify right side
    853.55x = 381,586.76
  5. Step 5: Solve for x
    x = 381,586.76/853.55
  6. Step 6: Final answer
    x = 447.06

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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.