Home / 7,131.28-9,841.62-3,987.70

Finding the Fourth Proportional to 7,131.28, 9,841.62 and 3,987.70

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Solution

The fourth proportional to 7,131.28, 9,841.62 and 3,987.70 is: 5,503.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,131.28 : 9,841.62 = 3,987.70 : x
  2. Step 2: Convert to fraction form
    7,131.28/9,841.62 = 3,987.70/x
  3. Step 3: Cross multiply
    7,131.28x = 9,841.62 × 3,987.70
  4. Step 4: Simplify right side
    7,131.28x = 39,245,428.07
  5. Step 5: Solve for x
    x = 39,245,428.07/7,131.28
  6. Step 6: Final answer
    x = 5,503.28

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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.