Home / 13,631.80-20,420.70-12,008.20

Finding the Fourth Proportional to 13,631.80, 20,420.70 and 12,008.20

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Solution

The fourth proportional to 13,631.80, 20,420.70 and 12,008.20 is: 17,988.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,631.80 : 20,420.70 = 12,008.20 : x
  2. Step 2: Convert to fraction form
    13,631.80/20,420.70 = 12,008.20/x
  3. Step 3: Cross multiply
    13,631.80x = 20,420.70 × 12,008.20
  4. Step 4: Simplify right side
    13,631.80x = 245,215,849.74
  5. Step 5: Solve for x
    x = 245,215,849.74/13,631.80
  6. Step 6: Final answer
    x = 17,988.52

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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.