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Finding the Fourth Proportional to 315.43, 434.92 and 215.89

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Solution

The fourth proportional to 315.43, 434.92 and 215.89 is: 297.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.43 : 434.92 = 215.89 : x
  2. Step 2: Convert to fraction form
    315.43/434.92 = 215.89/x
  3. Step 3: Cross multiply
    315.43x = 434.92 × 215.89
  4. Step 4: Simplify right side
    315.43x = 93,894.88
  5. Step 5: Solve for x
    x = 93,894.88/315.43
  6. Step 6: Final answer
    x = 297.68

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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.