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Finding the Fourth Proportional to 8,420.40, 12,622.34 and 7,173.81

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Solution

The fourth proportional to 8,420.40, 12,622.34 and 7,173.81 is: 10,753.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,420.40 : 12,622.34 = 7,173.81 : x
  2. Step 2: Convert to fraction form
    8,420.40/12,622.34 = 7,173.81/x
  3. Step 3: Cross multiply
    8,420.40x = 12,622.34 × 7,173.81
  4. Step 4: Simplify right side
    8,420.40x = 90,550,228.39
  5. Step 5: Solve for x
    x = 90,550,228.39/8,420.40
  6. Step 6: Final answer
    x = 10,753.68

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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.