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Finding the Fourth Proportional to 315, 472.64 and 178.16

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Solution

The fourth proportional to 315, 472.64 and 178.16 is: 267.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    315 : 472.64 = 178.16 : x
  2. Step 2: Convert to fraction form
    315/472.64 = 178.16/x
  3. Step 3: Cross multiply
    315x = 472.64 × 178.16
  4. Step 4: Simplify right side
    315x = 84,205.54
  5. Step 5: Solve for x
    x = 84,205.54/315
  6. Step 6: Final answer
    x = 267.32

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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.