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Finding the Fourth Proportional to 210.36, 315.13 and 118.78

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Solution

The fourth proportional to 210.36, 315.13 and 118.78 is: 177.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.36 : 315.13 = 118.78 : x
  2. Step 2: Convert to fraction form
    210.36/315.13 = 118.78/x
  3. Step 3: Cross multiply
    210.36x = 315.13 × 118.78
  4. Step 4: Simplify right side
    210.36x = 37,431.14
  5. Step 5: Solve for x
    x = 37,431.14/210.36
  6. Step 6: Final answer
    x = 177.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.