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Finding the Fourth Proportional to 939.01, 1,408.16 and 314.18

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Solution

The fourth proportional to 939.01, 1,408.16 and 314.18 is: 471.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.01 : 1,408.16 = 314.18 : x
  2. Step 2: Convert to fraction form
    939.01/1,408.16 = 314.18/x
  3. Step 3: Cross multiply
    939.01x = 1,408.16 × 314.18
  4. Step 4: Simplify right side
    939.01x = 442,415.71
  5. Step 5: Solve for x
    x = 442,415.71/939.01
  6. Step 6: Final answer
    x = 471.15

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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.