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Finding the Fourth Proportional to 210.79, 316.35 and 113.35

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Solution

The fourth proportional to 210.79, 316.35 and 113.35 is: 170.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.79 : 316.35 = 113.35 : x
  2. Step 2: Convert to fraction form
    210.79/316.35 = 113.35/x
  3. Step 3: Cross multiply
    210.79x = 316.35 × 113.35
  4. Step 4: Simplify right side
    210.79x = 35,858.27
  5. Step 5: Solve for x
    x = 35,858.27/210.79
  6. Step 6: Final answer
    x = 170.11

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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.