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Finding the Fourth Proportional to 499.15, 748.40 and 206.57

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Solution

The fourth proportional to 499.15, 748.40 and 206.57 is: 309.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.15 : 748.40 = 206.57 : x
  2. Step 2: Convert to fraction form
    499.15/748.40 = 206.57/x
  3. Step 3: Cross multiply
    499.15x = 748.40 × 206.57
  4. Step 4: Simplify right side
    499.15x = 154,594.21
  5. Step 5: Solve for x
    x = 154,594.21/499.15
  6. Step 6: Final answer
    x = 309.72

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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.