Home / 71,987.40-99,340.38-40,161.69

Finding the Fourth Proportional to 71,987.40, 99,340.38 and 40,161.69

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Solution

The fourth proportional to 71,987.40, 99,340.38 and 40,161.69 is: 55,421.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,987.40 : 99,340.38 = 40,161.69 : x
  2. Step 2: Convert to fraction form
    71,987.40/99,340.38 = 40,161.69/x
  3. Step 3: Cross multiply
    71,987.40x = 99,340.38 × 40,161.69
  4. Step 4: Simplify right side
    71,987.40x = 3,989,677,546.04
  5. Step 5: Solve for x
    x = 3,989,677,546.04/71,987.40
  6. Step 6: Final answer
    x = 55,421.89

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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.