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Finding the Fourth Proportional to 6,391.88, 8,818.26 and 3,909.32

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Solution

The fourth proportional to 6,391.88, 8,818.26 and 3,909.32 is: 5,393.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,391.88 : 8,818.26 = 3,909.32 : x
  2. Step 2: Convert to fraction form
    6,391.88/8,818.26 = 3,909.32/x
  3. Step 3: Cross multiply
    6,391.88x = 8,818.26 × 3,909.32
  4. Step 4: Simplify right side
    6,391.88x = 34,473,400.18
  5. Step 5: Solve for x
    x = 34,473,400.18/6,391.88
  6. Step 6: Final answer
    x = 5,393.31

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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.