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Finding the Fourth Proportional to 163,855.70, 245,791.65 and 85,123.70

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Solution

The fourth proportional to 163,855.70, 245,791.65 and 85,123.70 is: 127,689.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    163,855.70 : 245,791.65 = 85,123.70 : x
  2. Step 2: Convert to fraction form
    163,855.70/245,791.65 = 85,123.70/x
  3. Step 3: Cross multiply
    163,855.70x = 245,791.65 × 85,123.70
  4. Step 4: Simplify right side
    163,855.70x = 20,922,694,677.11
  5. Step 5: Solve for x
    x = 20,922,694,677.11/163,855.70
  6. Step 6: Final answer
    x = 127,689.76

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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.