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Finding the Fourth Proportional to 68,471.80, 102,707.70 and 38,878.20

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Solution

The fourth proportional to 68,471.80, 102,707.70 and 38,878.20 is: 58,317.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,471.80 : 102,707.70 = 38,878.20 : x
  2. Step 2: Convert to fraction form
    68,471.80/102,707.70 = 38,878.20/x
  3. Step 3: Cross multiply
    68,471.80x = 102,707.70 × 38,878.20
  4. Step 4: Simplify right side
    68,471.80x = 3,993,090,502.14
  5. Step 5: Solve for x
    x = 3,993,090,502.14/68,471.80
  6. Step 6: Final answer
    x = 58,317.30

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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.