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Finding the Fourth Proportional to 930.55, 1,395.95 and 281.33

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Solution

The fourth proportional to 930.55, 1,395.95 and 281.33 is: 422.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.55 : 1,395.95 = 281.33 : x
  2. Step 2: Convert to fraction form
    930.55/1,395.95 = 281.33/x
  3. Step 3: Cross multiply
    930.55x = 1,395.95 × 281.33
  4. Step 4: Simplify right side
    930.55x = 392,722.61
  5. Step 5: Solve for x
    x = 392,722.61/930.55
  6. Step 6: Final answer
    x = 422.03

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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.