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Finding the Fourth Proportional to 938.12, 1,407.72 and 361.40

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Solution

The fourth proportional to 938.12, 1,407.72 and 361.40 is: 542.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.12 : 1,407.72 = 361.40 : x
  2. Step 2: Convert to fraction form
    938.12/1,407.72 = 361.40/x
  3. Step 3: Cross multiply
    938.12x = 1,407.72 × 361.40
  4. Step 4: Simplify right side
    938.12x = 508,750.01
  5. Step 5: Solve for x
    x = 508,750.01/938.12
  6. Step 6: Final answer
    x = 542.31

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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.