Home / 12,387.78-18,576.81-4,990.86

Finding the Fourth Proportional to 12,387.78, 18,576.81 and 4,990.86

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Solution

The fourth proportional to 12,387.78, 18,576.81 and 4,990.86 is: 7,484.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,387.78 : 18,576.81 = 4,990.86 : x
  2. Step 2: Convert to fraction form
    12,387.78/18,576.81 = 4,990.86/x
  3. Step 3: Cross multiply
    12,387.78x = 18,576.81 × 4,990.86
  4. Step 4: Simplify right side
    12,387.78x = 92,714,257.96
  5. Step 5: Solve for x
    x = 92,714,257.96/12,387.78
  6. Step 6: Final answer
    x = 7,484.33

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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.