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Finding the Fourth Proportional to 315.75, 472.85 and 260.57

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Solution

The fourth proportional to 315.75, 472.85 and 260.57 is: 390.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.75 : 472.85 = 260.57 : x
  2. Step 2: Convert to fraction form
    315.75/472.85 = 260.57/x
  3. Step 3: Cross multiply
    315.75x = 472.85 × 260.57
  4. Step 4: Simplify right side
    315.75x = 123,208.16
  5. Step 5: Solve for x
    x = 123,208.16/315.75
  6. Step 6: Final answer
    x = 390.21

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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.