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Finding the Fourth Proportional to 3,129.30, 4,693.95 and 938.79

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Solution

The fourth proportional to 3,129.30, 4,693.95 and 938.79 is: 1,408.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,129.30 : 4,693.95 = 938.79 : x
  2. Step 2: Convert to fraction form
    3,129.30/4,693.95 = 938.79/x
  3. Step 3: Cross multiply
    3,129.30x = 4,693.95 × 938.79
  4. Step 4: Simplify right side
    3,129.30x = 4,406,633.32
  5. Step 5: Solve for x
    x = 4,406,633.32/3,129.30
  6. Step 6: Final answer
    x = 1,408.19

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1.5x scale

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.