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Finding the Fourth Proportional to 67,818.80, 101,728.20 and 20,435.60

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Solution

The fourth proportional to 67,818.80, 101,728.20 and 20,435.60 is: 30,653.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,818.80 : 101,728.20 = 20,435.60 : x
  2. Step 2: Convert to fraction form
    67,818.80/101,728.20 = 20,435.60/x
  3. Step 3: Cross multiply
    67,818.80x = 101,728.20 × 20,435.60
  4. Step 4: Simplify right side
    67,818.80x = 2,078,876,803.92
  5. Step 5: Solve for x
    x = 2,078,876,803.92/67,818.80
  6. Step 6: Final answer
    x = 30,653.40

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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.