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Finding the Fourth Proportional to 938.70, 1,408.13 and 322.15

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Solution

The fourth proportional to 938.70, 1,408.13 and 322.15 is: 483.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.70 : 1,408.13 = 322.15 : x
  2. Step 2: Convert to fraction form
    938.70/1,408.13 = 322.15/x
  3. Step 3: Cross multiply
    938.70x = 1,408.13 × 322.15
  4. Step 4: Simplify right side
    938.70x = 453,629.08
  5. Step 5: Solve for x
    x = 453,629.08/938.70
  6. Step 6: Final answer
    x = 483.25

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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.