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Finding the Fourth Proportional to 67,178.20, 100,840.20 and 42,246.40

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Solution

The fourth proportional to 67,178.20, 100,840.20 and 42,246.40 is: 63,415.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,178.20 : 100,840.20 = 42,246.40 : x
  2. Step 2: Convert to fraction form
    67,178.20/100,840.20 = 42,246.40/x
  3. Step 3: Cross multiply
    67,178.20x = 100,840.20 × 42,246.40
  4. Step 4: Simplify right side
    67,178.20x = 4,260,135,425.28
  5. Step 5: Solve for x
    x = 4,260,135,425.28/67,178.20
  6. Step 6: Final answer
    x = 63,415.44

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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.