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Finding the Fourth Proportional to 8,420.72, 12,631.03 and 2,180.72

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Solution

The fourth proportional to 8,420.72, 12,631.03 and 2,180.72 is: 3,271.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,420.72 : 12,631.03 = 2,180.72 : x
  2. Step 2: Convert to fraction form
    8,420.72/12,631.03 = 2,180.72/x
  3. Step 3: Cross multiply
    8,420.72x = 12,631.03 × 2,180.72
  4. Step 4: Simplify right side
    8,420.72x = 27,544,671.13
  5. Step 5: Solve for x
    x = 27,544,671.13/8,420.72
  6. Step 6: Final answer
    x = 3,271.06

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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.