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Finding the Fourth Proportional to 209.12, 313.72 and 72.16

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Solution

The fourth proportional to 209.12, 313.72 and 72.16 is: 108.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.12 : 313.72 = 72.16 : x
  2. Step 2: Convert to fraction form
    209.12/313.72 = 72.16/x
  3. Step 3: Cross multiply
    209.12x = 313.72 × 72.16
  4. Step 4: Simplify right side
    209.12x = 22,638.04
  5. Step 5: Solve for x
    x = 22,638.04/209.12
  6. Step 6: Final answer
    x = 108.25

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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.