Home / 8,221.32-11,351.88-5,390.64

Finding the Fourth Proportional to 8,221.32, 11,351.88 and 5,390.64

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Solution

The fourth proportional to 8,221.32, 11,351.88 and 5,390.64 is: 7,443.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,221.32 : 11,351.88 = 5,390.64 : x
  2. Step 2: Convert to fraction form
    8,221.32/11,351.88 = 5,390.64/x
  3. Step 3: Cross multiply
    8,221.32x = 11,351.88 × 5,390.64
  4. Step 4: Simplify right side
    8,221.32x = 61,193,898.40
  5. Step 5: Solve for x
    x = 61,193,898.40/8,221.32
  6. Step 6: Final answer
    x = 7,443.32

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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.