Home / 15,119.28-20,864.70-8,405.54

Finding the Fourth Proportional to 15,119.28, 20,864.70 and 8,405.54

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Solution

The fourth proportional to 15,119.28, 20,864.70 and 8,405.54 is: 11,599.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,119.28 : 20,864.70 = 8,405.54 : x
  2. Step 2: Convert to fraction form
    15,119.28/20,864.70 = 8,405.54/x
  3. Step 3: Cross multiply
    15,119.28x = 20,864.70 × 8,405.54
  4. Step 4: Simplify right side
    15,119.28x = 175,379,070.44
  5. Step 5: Solve for x
    x = 175,379,070.44/15,119.28
  6. Step 6: Final answer
    x = 11,599.70

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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.