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Finding the Fourth Proportional to 6,387.88, 8,812.74 and 3,905.32

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Solution

The fourth proportional to 6,387.88, 8,812.74 and 3,905.32 is: 5,387.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,387.88 : 8,812.74 = 3,905.32 : x
  2. Step 2: Convert to fraction form
    6,387.88/8,812.74 = 3,905.32/x
  3. Step 3: Cross multiply
    6,387.88x = 8,812.74 × 3,905.32
  4. Step 4: Simplify right side
    6,387.88x = 34,416,569.78
  5. Step 5: Solve for x
    x = 34,416,569.78/6,387.88
  6. Step 6: Final answer
    x = 5,387.79

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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.