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Finding the Fourth Proportional to 6,407.80, 9,611.70 and 4,220.80

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Solution

The fourth proportional to 6,407.80, 9,611.70 and 4,220.80 is: 6,331.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,407.80 : 9,611.70 = 4,220.80 : x
  2. Step 2: Convert to fraction form
    6,407.80/9,611.70 = 4,220.80/x
  3. Step 3: Cross multiply
    6,407.80x = 9,611.70 × 4,220.80
  4. Step 4: Simplify right side
    6,407.80x = 40,569,063.36
  5. Step 5: Solve for x
    x = 40,569,063.36/6,407.80
  6. Step 6: Final answer
    x = 6,331.20

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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.