Home / 8,281.20-12,421.80-5,324.40

Finding the Fourth Proportional to 8,281.20, 12,421.80 and 5,324.40

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Solution

The fourth proportional to 8,281.20, 12,421.80 and 5,324.40 is: 7,986.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,281.20 : 12,421.80 = 5,324.40 : x
  2. Step 2: Convert to fraction form
    8,281.20/12,421.80 = 5,324.40/x
  3. Step 3: Cross multiply
    8,281.20x = 12,421.80 × 5,324.40
  4. Step 4: Simplify right side
    8,281.20x = 66,138,631.92
  5. Step 5: Solve for x
    x = 66,138,631.92/8,281.20
  6. Step 6: Final answer
    x = 7,986.60

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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.