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Finding the Fourth Proportional to 315.09, 472.05 and 260.82

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Solution

The fourth proportional to 315.09, 472.05 and 260.82 is: 390.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.09 : 472.05 = 260.82 : x
  2. Step 2: Convert to fraction form
    315.09/472.05 = 260.82/x
  3. Step 3: Cross multiply
    315.09x = 472.05 × 260.82
  4. Step 4: Simplify right side
    315.09x = 123,120.08
  5. Step 5: Solve for x
    x = 123,120.08/315.09
  6. Step 6: Final answer
    x = 390.75

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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.