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Finding the Fourth Proportional to 315.36, 435.28 and 212.08

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Solution

The fourth proportional to 315.36, 435.28 and 212.08 is: 292.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.36 : 435.28 = 212.08 : x
  2. Step 2: Convert to fraction form
    315.36/435.28 = 212.08/x
  3. Step 3: Cross multiply
    315.36x = 435.28 × 212.08
  4. Step 4: Simplify right side
    315.36x = 92,314.18
  5. Step 5: Solve for x
    x = 92,314.18/315.36
  6. Step 6: Final answer
    x = 292.73

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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.