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Finding the Fourth Proportional to 67,218.40, 100,827.60 and 20,465.20

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Solution

The fourth proportional to 67,218.40, 100,827.60 and 20,465.20 is: 30,697.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,218.40 : 100,827.60 = 20,465.20 : x
  2. Step 2: Convert to fraction form
    67,218.40/100,827.60 = 20,465.20/x
  3. Step 3: Cross multiply
    67,218.40x = 100,827.60 × 20,465.20
  4. Step 4: Simplify right side
    67,218.40x = 2,063,456,999.52
  5. Step 5: Solve for x
    x = 2,063,456,999.52/67,218.40
  6. Step 6: Final answer
    x = 30,697.80

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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.