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Finding the Fourth Proportional to 68,901.40, 103,412.85 and 40,786.30

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Solution

The fourth proportional to 68,901.40, 103,412.85 and 40,786.30 is: 61,215.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,901.40 : 103,412.85 = 40,786.30 : x
  2. Step 2: Convert to fraction form
    68,901.40/103,412.85 = 40,786.30/x
  3. Step 3: Cross multiply
    68,901.40x = 103,412.85 × 40,786.30
  4. Step 4: Simplify right side
    68,901.40x = 4,217,827,523.96
  5. Step 5: Solve for x
    x = 4,217,827,523.96/68,901.40
  6. Step 6: Final answer
    x = 61,215.41

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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.