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Finding the Fourth Proportional to 69,022.80, 103,631.40 and 42,778.80

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Solution

The fourth proportional to 69,022.80, 103,631.40 and 42,778.80 is: 64,228.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,022.80 : 103,631.40 = 42,778.80 : x
  2. Step 2: Convert to fraction form
    69,022.80/103,631.40 = 42,778.80/x
  3. Step 3: Cross multiply
    69,022.80x = 103,631.40 × 42,778.80
  4. Step 4: Simplify right side
    69,022.80x = 4,433,226,934.32
  5. Step 5: Solve for x
    x = 4,433,226,934.32/69,022.80
  6. Step 6: Final answer
    x = 64,228.44

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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.