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Finding the Fourth Proportional to 342.91, 472.84 and 315.16

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Solution

The fourth proportional to 342.91, 472.84 and 315.16 is: 434.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.91 : 472.84 = 315.16 : x
  2. Step 2: Convert to fraction form
    342.91/472.84 = 315.16/x
  3. Step 3: Cross multiply
    342.91x = 472.84 × 315.16
  4. Step 4: Simplify right side
    342.91x = 149,020.25
  5. Step 5: Solve for x
    x = 149,020.25/342.91
  6. Step 6: Final answer
    x = 434.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.