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Finding the Fourth Proportional to 939.61, 1,408.59 and 477.17

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Solution

The fourth proportional to 939.61, 1,408.59 and 477.17 is: 715.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.61 : 1,408.59 = 477.17 : x
  2. Step 2: Convert to fraction form
    939.61/1,408.59 = 477.17/x
  3. Step 3: Cross multiply
    939.61x = 1,408.59 × 477.17
  4. Step 4: Simplify right side
    939.61x = 672,129.85
  5. Step 5: Solve for x
    x = 672,129.85/939.61
  6. Step 6: Final answer
    x = 715.33

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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.