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Finding the Fourth Proportional to 8,720.66, 12,021.80 and 6,621.14

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Solution

The fourth proportional to 8,720.66, 12,021.80 and 6,621.14 is: 9,127.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.66 : 12,021.80 = 6,621.14 : x
  2. Step 2: Convert to fraction form
    8,720.66/12,021.80 = 6,621.14/x
  3. Step 3: Cross multiply
    8,720.66x = 12,021.80 × 6,621.14
  4. Step 4: Simplify right side
    8,720.66x = 79,598,020.85
  5. Step 5: Solve for x
    x = 79,598,020.85/8,720.66
  6. Step 6: Final answer
    x = 9,127.52

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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.