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Finding the Fourth Proportional to 71,681.28, 98,920.80 and 39,850.80

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Solution

The fourth proportional to 71,681.28, 98,920.80 and 39,850.80 is: 54,994.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,681.28 : 98,920.80 = 39,850.80 : x
  2. Step 2: Convert to fraction form
    71,681.28/98,920.80 = 39,850.80/x
  3. Step 3: Cross multiply
    71,681.28x = 98,920.80 × 39,850.80
  4. Step 4: Simplify right side
    71,681.28x = 3,942,073,016.64
  5. Step 5: Solve for x
    x = 3,942,073,016.64/71,681.28
  6. Step 6: Final answer
    x = 54,994.46

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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.