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Finding the Fourth Proportional to 930.74, 1,395.57 and 281.30

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Solution

The fourth proportional to 930.74, 1,395.57 and 281.30 is: 421.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.74 : 1,395.57 = 281.30 : x
  2. Step 2: Convert to fraction form
    930.74/1,395.57 = 281.30/x
  3. Step 3: Cross multiply
    930.74x = 1,395.57 × 281.30
  4. Step 4: Simplify right side
    930.74x = 392,573.84
  5. Step 5: Solve for x
    x = 392,573.84/930.74
  6. Step 6: Final answer
    x = 421.79

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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.