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Finding the Fourth Proportional to 211,367.47, 316,959.05 and 79,947.31

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Solution

The fourth proportional to 211,367.47, 316,959.05 and 79,947.31 is: 119,886.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,367.47 : 316,959.05 = 79,947.31 : x
  2. Step 2: Convert to fraction form
    211,367.47/316,959.05 = 79,947.31/x
  3. Step 3: Cross multiply
    211,367.47x = 316,959.05 × 79,947.31
  4. Step 4: Simplify right side
    211,367.47x = 25,340,023,427.66
  5. Step 5: Solve for x
    x = 25,340,023,427.66/211,367.47
  6. Step 6: Final answer
    x = 119,886.11

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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.