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Finding the Fourth Proportional to 1,059.78, 1,589.52 and 511.82

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Solution

The fourth proportional to 1,059.78, 1,589.52 and 511.82 is: 767.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,059.78 : 1,589.52 = 511.82 : x
  2. Step 2: Convert to fraction form
    1,059.78/1,589.52 = 511.82/x
  3. Step 3: Cross multiply
    1,059.78x = 1,589.52 × 511.82
  4. Step 4: Simplify right side
    1,059.78x = 813,548.06
  5. Step 5: Solve for x
    x = 813,548.06/1,059.78
  6. Step 6: Final answer
    x = 767.65

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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.