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Finding the Fourth Proportional to 8,317.80, 12,478.70 and 2,771.20

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Solution

The fourth proportional to 8,317.80, 12,478.70 and 2,771.20 is: 4,157.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,317.80 : 12,478.70 = 2,771.20 : x
  2. Step 2: Convert to fraction form
    8,317.80/12,478.70 = 2,771.20/x
  3. Step 3: Cross multiply
    8,317.80x = 12,478.70 × 2,771.20
  4. Step 4: Simplify right side
    8,317.80x = 34,580,973.44
  5. Step 5: Solve for x
    x = 34,580,973.44/8,317.80
  6. Step 6: Final answer
    x = 4,157.47

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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.