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Finding the Fourth Proportional to 6,987.40, 9,642.65 and 3,800.73

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Solution

The fourth proportional to 6,987.40, 9,642.65 and 3,800.73 is: 5,245.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,987.40 : 9,642.65 = 3,800.73 : x
  2. Step 2: Convert to fraction form
    6,987.40/9,642.65 = 3,800.73/x
  3. Step 3: Cross multiply
    6,987.40x = 9,642.65 × 3,800.73
  4. Step 4: Simplify right side
    6,987.40x = 36,649,109.13
  5. Step 5: Solve for x
    x = 36,649,109.13/6,987.40
  6. Step 6: Final answer
    x = 5,245.03

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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.