Home / 71,818.19-99,112.63-39,986.40

Finding the Fourth Proportional to 71,818.19, 99,112.63 and 39,986.40

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Solution

The fourth proportional to 71,818.19, 99,112.63 and 39,986.40 is: 55,183.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,818.19 : 99,112.63 = 39,986.40 : x
  2. Step 2: Convert to fraction form
    71,818.19/99,112.63 = 39,986.40/x
  3. Step 3: Cross multiply
    71,818.19x = 99,112.63 × 39,986.40
  4. Step 4: Simplify right side
    71,818.19x = 3,963,157,268.23
  5. Step 5: Solve for x
    x = 3,963,157,268.23/71,818.19
  6. Step 6: Final answer
    x = 55,183.20

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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.