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Finding the Fourth Proportional to 6,781.64, 9,356.82 and 4,129.16

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Solution

The fourth proportional to 6,781.64, 9,356.82 and 4,129.16 is: 5,697.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,781.64 : 9,356.82 = 4,129.16 : x
  2. Step 2: Convert to fraction form
    6,781.64/9,356.82 = 4,129.16/x
  3. Step 3: Cross multiply
    6,781.64x = 9,356.82 × 4,129.16
  4. Step 4: Simplify right side
    6,781.64x = 38,635,806.87
  5. Step 5: Solve for x
    x = 38,635,806.87/6,781.64
  6. Step 6: Final answer
    x = 5,697.12

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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.