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Finding the Fourth Proportional to 938.42, 1,407.75 and 321.95

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Solution

The fourth proportional to 938.42, 1,407.75 and 321.95 is: 482.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.42 : 1,407.75 = 321.95 : x
  2. Step 2: Convert to fraction form
    938.42/1,407.75 = 321.95/x
  3. Step 3: Cross multiply
    938.42x = 1,407.75 × 321.95
  4. Step 4: Simplify right side
    938.42x = 453,218.07
  5. Step 5: Solve for x
    x = 453,218.07/938.42
  6. Step 6: Final answer
    x = 482.96

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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.