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Finding the Fourth Proportional to 930.32, 1,395.49 and 281.06

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Solution

The fourth proportional to 930.32, 1,395.49 and 281.06 is: 421.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.32 : 1,395.49 = 281.06 : x
  2. Step 2: Convert to fraction form
    930.32/1,395.49 = 281.06/x
  3. Step 3: Cross multiply
    930.32x = 1,395.49 × 281.06
  4. Step 4: Simplify right side
    930.32x = 392,216.42
  5. Step 5: Solve for x
    x = 392,216.42/930.32
  6. Step 6: Final answer
    x = 421.59

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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.