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Finding the Fourth Proportional to 68,900.40, 103,411.35 and 40,785.30

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Solution

The fourth proportional to 68,900.40, 103,411.35 and 40,785.30 is: 61,213.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,900.40 : 103,411.35 = 40,785.30 : x
  2. Step 2: Convert to fraction form
    68,900.40/103,411.35 = 40,785.30/x
  3. Step 3: Cross multiply
    68,900.40x = 103,411.35 × 40,785.30
  4. Step 4: Simplify right side
    68,900.40x = 4,217,662,933.16
  5. Step 5: Solve for x
    x = 4,217,662,933.16/68,900.40
  6. Step 6: Final answer
    x = 61,213.91

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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.