Home / 20,990.48-31,487.40-5,408.08

Finding the Fourth Proportional to 20,990.48, 31,487.40 and 5,408.08

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Solution

The fourth proportional to 20,990.48, 31,487.40 and 5,408.08 is: 8,112.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.48 : 31,487.40 = 5,408.08 : x
  2. Step 2: Convert to fraction form
    20,990.48/31,487.40 = 5,408.08/x
  3. Step 3: Cross multiply
    20,990.48x = 31,487.40 × 5,408.08
  4. Step 4: Simplify right side
    20,990.48x = 170,286,378.19
  5. Step 5: Solve for x
    x = 170,286,378.19/20,990.48
  6. Step 6: Final answer
    x = 8,112.55

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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.