Home / 8,181.20-12,281.40-5,271.60

Finding the Fourth Proportional to 8,181.20, 12,281.40 and 5,271.60

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Solution

The fourth proportional to 8,181.20, 12,281.40 and 5,271.60 is: 7,913.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,181.20 : 12,281.40 = 5,271.60 : x
  2. Step 2: Convert to fraction form
    8,181.20/12,281.40 = 5,271.60/x
  3. Step 3: Cross multiply
    8,181.20x = 12,281.40 × 5,271.60
  4. Step 4: Simplify right side
    8,181.20x = 64,742,628.24
  5. Step 5: Solve for x
    x = 64,742,628.24/8,181.20
  6. Step 6: Final answer
    x = 7,913.59

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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.