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Finding the Fourth Proportional to 1,339.78, 2,011.47 and 851.62

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Solution

The fourth proportional to 1,339.78, 2,011.47 and 851.62 is: 1,278.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.78 : 2,011.47 = 851.62 : x
  2. Step 2: Convert to fraction form
    1,339.78/2,011.47 = 851.62/x
  3. Step 3: Cross multiply
    1,339.78x = 2,011.47 × 851.62
  4. Step 4: Simplify right side
    1,339.78x = 1,713,008.08
  5. Step 5: Solve for x
    x = 1,713,008.08/1,339.78
  6. Step 6: Final answer
    x = 1,278.57

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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.