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Finding the Fourth Proportional to 8,720.78, 13,080.88 and 3,790.42

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Solution

The fourth proportional to 8,720.78, 13,080.88 and 3,790.42 is: 5,685.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.78 : 13,080.88 = 3,790.42 : x
  2. Step 2: Convert to fraction form
    8,720.78/13,080.88 = 3,790.42/x
  3. Step 3: Cross multiply
    8,720.78x = 13,080.88 × 3,790.42
  4. Step 4: Simplify right side
    8,720.78x = 49,582,029.17
  5. Step 5: Solve for x
    x = 49,582,029.17/8,720.78
  6. Step 6: Final answer
    x = 5,685.50

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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.