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Finding the Fourth Proportional to 68,320.40, 102,480.60 and 40,211.60

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Solution

The fourth proportional to 68,320.40, 102,480.60 and 40,211.60 is: 60,317.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,320.40 : 102,480.60 = 40,211.60 : x
  2. Step 2: Convert to fraction form
    68,320.40/102,480.60 = 40,211.60/x
  3. Step 3: Cross multiply
    68,320.40x = 102,480.60 × 40,211.60
  4. Step 4: Simplify right side
    68,320.40x = 4,120,908,894.96
  5. Step 5: Solve for x
    x = 4,120,908,894.96/68,320.40
  6. Step 6: Final answer
    x = 60,317.40

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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.