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Finding the Fourth Proportional to 8,312.80, 12,458.40 and 3,378.40

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Solution

The fourth proportional to 8,312.80, 12,458.40 and 3,378.40 is: 5,063.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,312.80 : 12,458.40 = 3,378.40 : x
  2. Step 2: Convert to fraction form
    8,312.80/12,458.40 = 3,378.40/x
  3. Step 3: Cross multiply
    8,312.80x = 12,458.40 × 3,378.40
  4. Step 4: Simplify right side
    8,312.80x = 42,089,458.56
  5. Step 5: Solve for x
    x = 42,089,458.56/8,312.80
  6. Step 6: Final answer
    x = 5,063.21

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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.