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Finding the Fourth Proportional to 472.75, 709.12 and 279.10

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Solution

The fourth proportional to 472.75, 709.12 and 279.10 is: 418.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.75 : 709.12 = 279.10 : x
  2. Step 2: Convert to fraction form
    472.75/709.12 = 279.10/x
  3. Step 3: Cross multiply
    472.75x = 709.12 × 279.10
  4. Step 4: Simplify right side
    472.75x = 197,916.63
  5. Step 5: Solve for x
    x = 197,916.63/472.75
  6. Step 6: Final answer
    x = 418.65

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Double scale
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Similar ratio
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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.