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Finding the Fourth Proportional to 68,879.70, 103,122.45 and 42,406.20

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Solution

The fourth proportional to 68,879.70, 103,122.45 and 42,406.20 is: 63,487.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,879.70 : 103,122.45 = 42,406.20 : x
  2. Step 2: Convert to fraction form
    68,879.70/103,122.45 = 42,406.20/x
  3. Step 3: Cross multiply
    68,879.70x = 103,122.45 × 42,406.20
  4. Step 4: Simplify right side
    68,879.70x = 4,373,031,239.19
  5. Step 5: Solve for x
    x = 4,373,031,239.19/68,879.70
  6. Step 6: Final answer
    x = 63,487.95

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1.5x scale

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.