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Finding the Fourth Proportional to 68,432.40, 102,648.60 and 18,520.20

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Solution

The fourth proportional to 68,432.40, 102,648.60 and 18,520.20 is: 27,780.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,432.40 : 102,648.60 = 18,520.20 : x
  2. Step 2: Convert to fraction form
    68,432.40/102,648.60 = 18,520.20/x
  3. Step 3: Cross multiply
    68,432.40x = 102,648.60 × 18,520.20
  4. Step 4: Simplify right side
    68,432.40x = 1,901,072,601.72
  5. Step 5: Solve for x
    x = 1,901,072,601.72/68,432.40
  6. Step 6: Final answer
    x = 27,780.30

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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.