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Finding the Fourth Proportional to 315.58, 472.38 and 279.12

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Solution

The fourth proportional to 315.58, 472.38 and 279.12 is: 417.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.58 : 472.38 = 279.12 : x
  2. Step 2: Convert to fraction form
    315.58/472.38 = 279.12/x
  3. Step 3: Cross multiply
    315.58x = 472.38 × 279.12
  4. Step 4: Simplify right side
    315.58x = 131,850.71
  5. Step 5: Solve for x
    x = 131,850.71/315.58
  6. Step 6: Final answer
    x = 417.80

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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.