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Finding the Fourth Proportional to 67,090.80, 100,636.20 and 42,207.60

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Solution

The fourth proportional to 67,090.80, 100,636.20 and 42,207.60 is: 63,311.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,090.80 : 100,636.20 = 42,207.60 : x
  2. Step 2: Convert to fraction form
    67,090.80/100,636.20 = 42,207.60/x
  3. Step 3: Cross multiply
    67,090.80x = 100,636.20 × 42,207.60
  4. Step 4: Simplify right side
    67,090.80x = 4,247,612,475.12
  5. Step 5: Solve for x
    x = 4,247,612,475.12/67,090.80
  6. Step 6: Final answer
    x = 63,311.40

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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.