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Finding the Fourth Proportional to 315.48, 435.43 and 215.85

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Solution

The fourth proportional to 315.48, 435.43 and 215.85 is: 297.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.48 : 435.43 = 215.85 : x
  2. Step 2: Convert to fraction form
    315.48/435.43 = 215.85/x
  3. Step 3: Cross multiply
    315.48x = 435.43 × 215.85
  4. Step 4: Simplify right side
    315.48x = 93,987.57
  5. Step 5: Solve for x
    x = 93,987.57/315.48
  6. Step 6: Final answer
    x = 297.92

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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.