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Finding the Fourth Proportional to 209.16, 313.50 and 87.24

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Solution

The fourth proportional to 209.16, 313.50 and 87.24 is: 130.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.16 : 313.50 = 87.24 : x
  2. Step 2: Convert to fraction form
    209.16/313.50 = 87.24/x
  3. Step 3: Cross multiply
    209.16x = 313.50 × 87.24
  4. Step 4: Simplify right side
    209.16x = 27,349.74
  5. Step 5: Solve for x
    x = 27,349.74/209.16
  6. Step 6: Final answer
    x = 130.76

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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.