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Finding the Fourth Proportional to 938.18, 1,405.97 and 352.58

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Solution

The fourth proportional to 938.18, 1,405.97 and 352.58 is: 528.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.18 : 1,405.97 = 352.58 : x
  2. Step 2: Convert to fraction form
    938.18/1,405.97 = 352.58/x
  3. Step 3: Cross multiply
    938.18x = 1,405.97 × 352.58
  4. Step 4: Simplify right side
    938.18x = 495,715.14
  5. Step 5: Solve for x
    x = 495,715.14/938.18
  6. Step 6: Final answer
    x = 528.38

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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.