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Finding the Fourth Proportional to 7,131.71, 9,842.19 and 3,987.92

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Solution

The fourth proportional to 7,131.71, 9,842.19 and 3,987.92 is: 5,503.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,131.71 : 9,842.19 = 3,987.92 : x
  2. Step 2: Convert to fraction form
    7,131.71/9,842.19 = 3,987.92/x
  3. Step 3: Cross multiply
    7,131.71x = 9,842.19 × 3,987.92
  4. Step 4: Simplify right side
    7,131.71x = 39,249,866.34
  5. Step 5: Solve for x
    x = 39,249,866.34/7,131.71
  6. Step 6: Final answer
    x = 5,503.57

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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.