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Finding the Fourth Proportional to 211.35, 316.98 and 72.51

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Solution

The fourth proportional to 211.35, 316.98 and 72.51 is: 108.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.35 : 316.98 = 72.51 : x
  2. Step 2: Convert to fraction form
    211.35/316.98 = 72.51/x
  3. Step 3: Cross multiply
    211.35x = 316.98 × 72.51
  4. Step 4: Simplify right side
    211.35x = 22,984.81
  5. Step 5: Solve for x
    x = 22,984.81/211.35
  6. Step 6: Final answer
    x = 108.75

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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.