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Finding the Fourth Proportional to 72,689.80, 100,245.18 and 47,169.40

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Solution

The fourth proportional to 72,689.80, 100,245.18 and 47,169.40 is: 65,050.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,689.80 : 100,245.18 = 47,169.40 : x
  2. Step 2: Convert to fraction form
    72,689.80/100,245.18 = 47,169.40/x
  3. Step 3: Cross multiply
    72,689.80x = 100,245.18 × 47,169.40
  4. Step 4: Simplify right side
    72,689.80x = 4,728,504,993.49
  5. Step 5: Solve for x
    x = 4,728,504,993.49/72,689.80
  6. Step 6: Final answer
    x = 65,050.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.