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Finding the Fourth Proportional to 6,420.87, 8,859.38 and 3,731.67

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Solution

The fourth proportional to 6,420.87, 8,859.38 and 3,731.67 is: 5,148.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420.87 : 8,859.38 = 3,731.67 : x
  2. Step 2: Convert to fraction form
    6,420.87/8,859.38 = 3,731.67/x
  3. Step 3: Cross multiply
    6,420.87x = 8,859.38 × 3,731.67
  4. Step 4: Simplify right side
    6,420.87x = 33,060,263.91
  5. Step 5: Solve for x
    x = 33,060,263.91/6,420.87
  6. Step 6: Final answer
    x = 5,148.88

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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.