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Finding the Fourth Proportional to 930.55, 1,395.87 and 281.38

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Solution

The fourth proportional to 930.55, 1,395.87 and 281.38 is: 422.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.55 : 1,395.87 = 281.38 : x
  2. Step 2: Convert to fraction form
    930.55/1,395.87 = 281.38/x
  3. Step 3: Cross multiply
    930.55x = 1,395.87 × 281.38
  4. Step 4: Simplify right side
    930.55x = 392,769.90
  5. Step 5: Solve for x
    x = 392,769.90/930.55
  6. Step 6: Final answer
    x = 422.08

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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.