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Finding the Fourth Proportional to 8,415, 12,622.50 and 3,221.01

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Solution

The fourth proportional to 8,415, 12,622.50 and 3,221.01 is: 4,831.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,415 : 12,622.50 = 3,221.01 : x
  2. Step 2: Convert to fraction form
    8,415/12,622.50 = 3,221.01/x
  3. Step 3: Cross multiply
    8,415x = 12,622.50 × 3,221.01
  4. Step 4: Simplify right side
    8,415x = 40,657,198.73
  5. Step 5: Solve for x
    x = 40,657,198.73/8,415
  6. Step 6: Final answer
    x = 4,831.52

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Double scale
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Similar ratio
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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.