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Finding the Fourth Proportional to 938.95, 1,408.43 and 391.13

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Solution

The fourth proportional to 938.95, 1,408.43 and 391.13 is: 586.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.95 : 1,408.43 = 391.13 : x
  2. Step 2: Convert to fraction form
    938.95/1,408.43 = 391.13/x
  3. Step 3: Cross multiply
    938.95x = 1,408.43 × 391.13
  4. Step 4: Simplify right side
    938.95x = 550,870.23
  5. Step 5: Solve for x
    x = 550,870.23/938.95
  6. Step 6: Final answer
    x = 586.69

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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.