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Finding the Fourth Proportional to 514.68, 771.90 and 206.40

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Solution

The fourth proportional to 514.68, 771.90 and 206.40 is: 309.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.68 : 771.90 = 206.40 : x
  2. Step 2: Convert to fraction form
    514.68/771.90 = 206.40/x
  3. Step 3: Cross multiply
    514.68x = 771.90 × 206.40
  4. Step 4: Simplify right side
    514.68x = 159,320.16
  5. Step 5: Solve for x
    x = 159,320.16/514.68
  6. Step 6: Final answer
    x = 309.55

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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.