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Finding the Fourth Proportional to 288.13, 431.55 and 206.72

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Solution

The fourth proportional to 288.13, 431.55 and 206.72 is: 309.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.13 : 431.55 = 206.72 : x
  2. Step 2: Convert to fraction form
    288.13/431.55 = 206.72/x
  3. Step 3: Cross multiply
    288.13x = 431.55 × 206.72
  4. Step 4: Simplify right side
    288.13x = 89,211.09
  5. Step 5: Solve for x
    x = 89,211.09/288.13
  6. Step 6: Final answer
    x = 309.62

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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.