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Finding the Fourth Proportional to 938.34, 1,407.62 and 829.88

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Solution

The fourth proportional to 938.34, 1,407.62 and 829.88 is: 1,244.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.34 : 1,407.62 = 829.88 : x
  2. Step 2: Convert to fraction form
    938.34/1,407.62 = 829.88/x
  3. Step 3: Cross multiply
    938.34x = 1,407.62 × 829.88
  4. Step 4: Simplify right side
    938.34x = 1,168,155.69
  5. Step 5: Solve for x
    x = 1,168,155.69/938.34
  6. Step 6: Final answer
    x = 1,244.92

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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.