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Finding the Fourth Proportional to 6,347.80, 8,765.34 and 3,990.70

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Solution

The fourth proportional to 6,347.80, 8,765.34 and 3,990.70 is: 5,510.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,347.80 : 8,765.34 = 3,990.70 : x
  2. Step 2: Convert to fraction form
    6,347.80/8,765.34 = 3,990.70/x
  3. Step 3: Cross multiply
    6,347.80x = 8,765.34 × 3,990.70
  4. Step 4: Simplify right side
    6,347.80x = 34,979,842.34
  5. Step 5: Solve for x
    x = 34,979,842.34/6,347.80
  6. Step 6: Final answer
    x = 5,510.55

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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.