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Finding the Fourth Proportional to 315.81, 435.87 and 291.11

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Solution

The fourth proportional to 315.81, 435.87 and 291.11 is: 401.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.81 : 435.87 = 291.11 : x
  2. Step 2: Convert to fraction form
    315.81/435.87 = 291.11/x
  3. Step 3: Cross multiply
    315.81x = 435.87 × 291.11
  4. Step 4: Simplify right side
    315.81x = 126,883.94
  5. Step 5: Solve for x
    x = 126,883.94/315.81
  6. Step 6: Final answer
    x = 401.77

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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.