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Finding the Fourth Proportional to 8,815.03, 12,180.81 and 6,420.84

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Solution

The fourth proportional to 8,815.03, 12,180.81 and 6,420.84 is: 8,872.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,815.03 : 12,180.81 = 6,420.84 : x
  2. Step 2: Convert to fraction form
    8,815.03/12,180.81 = 6,420.84/x
  3. Step 3: Cross multiply
    8,815.03x = 12,180.81 × 6,420.84
  4. Step 4: Simplify right side
    8,815.03x = 78,211,010.48
  5. Step 5: Solve for x
    x = 78,211,010.48/8,815.03
  6. Step 6: Final answer
    x = 8,872.46

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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.