Home / 71,639.40-98,857.85-39,806.40

Finding the Fourth Proportional to 71,639.40, 98,857.85 and 39,806.40

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Solution

The fourth proportional to 71,639.40, 98,857.85 and 39,806.40 is: 54,930.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,639.40 : 98,857.85 = 39,806.40 : x
  2. Step 2: Convert to fraction form
    71,639.40/98,857.85 = 39,806.40/x
  3. Step 3: Cross multiply
    71,639.40x = 98,857.85 × 39,806.40
  4. Step 4: Simplify right side
    71,639.40x = 3,935,175,120.24
  5. Step 5: Solve for x
    x = 3,935,175,120.24/71,639.40
  6. Step 6: Final answer
    x = 54,930.32

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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.