Home / 8,621-12,931.50-2,778.20

Finding the Fourth Proportional to 8,621, 12,931.50 and 2,778.20

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Solution

The fourth proportional to 8,621, 12,931.50 and 2,778.20 is: 4,167.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,621 : 12,931.50 = 2,778.20 : x
  2. Step 2: Convert to fraction form
    8,621/12,931.50 = 2,778.20/x
  3. Step 3: Cross multiply
    8,621x = 12,931.50 × 2,778.20
  4. Step 4: Simplify right side
    8,621x = 35,926,293.30
  5. Step 5: Solve for x
    x = 35,926,293.30/8,621
  6. Step 6: Final answer
    x = 4,167.30

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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.