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Finding the Fourth Proportional to 1,666, 2,499.05 and 511.75

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Solution

The fourth proportional to 1,666, 2,499.05 and 511.75 is: 767.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,666 : 2,499.05 = 511.75 : x
  2. Step 2: Convert to fraction form
    1,666/2,499.05 = 511.75/x
  3. Step 3: Cross multiply
    1,666x = 2,499.05 × 511.75
  4. Step 4: Simplify right side
    1,666x = 1,278,888.84
  5. Step 5: Solve for x
    x = 1,278,888.84/1,666
  6. Step 6: Final answer
    x = 767.64

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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.