Home / 15,134.60-20,885.68-8,420.87

Finding the Fourth Proportional to 15,134.60, 20,885.68 and 8,420.87

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Solution

The fourth proportional to 15,134.60, 20,885.68 and 8,420.87 is: 11,620.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,134.60 : 20,885.68 = 8,420.87 : x
  2. Step 2: Convert to fraction form
    15,134.60/20,885.68 = 8,420.87/x
  3. Step 3: Cross multiply
    15,134.60x = 20,885.68 × 8,420.87
  4. Step 4: Simplify right side
    15,134.60x = 175,875,596.14
  5. Step 5: Solve for x
    x = 175,875,596.14/15,134.60
  6. Step 6: Final answer
    x = 11,620.76

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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.