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Finding the Fourth Proportional to 13,421.10, 20,131.65 and 6,860.10

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Solution

The fourth proportional to 13,421.10, 20,131.65 and 6,860.10 is: 10,290.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.10 : 20,131.65 = 6,860.10 : x
  2. Step 2: Convert to fraction form
    13,421.10/20,131.65 = 6,860.10/x
  3. Step 3: Cross multiply
    13,421.10x = 20,131.65 × 6,860.10
  4. Step 4: Simplify right side
    13,421.10x = 138,105,132.17
  5. Step 5: Solve for x
    x = 138,105,132.17/13,421.10
  6. Step 6: Final answer
    x = 10,290.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.