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Finding the Fourth Proportional to 315.78, 436.26 and 269.10

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Solution

The fourth proportional to 315.78, 436.26 and 269.10 is: 371.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.78 : 436.26 = 269.10 : x
  2. Step 2: Convert to fraction form
    315.78/436.26 = 269.10/x
  3. Step 3: Cross multiply
    315.78x = 436.26 × 269.10
  4. Step 4: Simplify right side
    315.78x = 117,397.57
  5. Step 5: Solve for x
    x = 117,397.57/315.78
  6. Step 6: Final answer
    x = 371.77

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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.