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Finding the Fourth Proportional to 315.90, 472.64 and 261.23

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Solution

The fourth proportional to 315.90, 472.64 and 261.23 is: 390.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.90 : 472.64 = 261.23 : x
  2. Step 2: Convert to fraction form
    315.90/472.64 = 261.23/x
  3. Step 3: Cross multiply
    315.90x = 472.64 × 261.23
  4. Step 4: Simplify right side
    315.90x = 123,464.08
  5. Step 5: Solve for x
    x = 123,464.08/315.90
  6. Step 6: Final answer
    x = 390.83

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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.