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Finding the Fourth Proportional to 159,390.78, 219,959.28 and 87,770.63

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Solution

The fourth proportional to 159,390.78, 219,959.28 and 87,770.63 is: 121,123.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,390.78 : 219,959.28 = 87,770.63 : x
  2. Step 2: Convert to fraction form
    159,390.78/219,959.28 = 87,770.63/x
  3. Step 3: Cross multiply
    159,390.78x = 219,959.28 × 87,770.63
  4. Step 4: Simplify right side
    159,390.78x = 19,305,964,579.95
  5. Step 5: Solve for x
    x = 19,305,964,579.95/159,390.78
  6. Step 6: Final answer
    x = 121,123.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.