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Finding the Fourth Proportional to 71,989.20, 107,846.10 and 38,698.20

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Solution

The fourth proportional to 71,989.20, 107,846.10 and 38,698.20 is: 57,973.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,989.20 : 107,846.10 = 38,698.20 : x
  2. Step 2: Convert to fraction form
    71,989.20/107,846.10 = 38,698.20/x
  3. Step 3: Cross multiply
    71,989.20x = 107,846.10 × 38,698.20
  4. Step 4: Simplify right side
    71,989.20x = 4,173,449,947.02
  5. Step 5: Solve for x
    x = 4,173,449,947.02/71,989.20
  6. Step 6: Final answer
    x = 57,973.28

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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.