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Finding the Fourth Proportional to 7,781.86, 10,739.28 and 4,245.22

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Solution

The fourth proportional to 7,781.86, 10,739.28 and 4,245.22 is: 5,858.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,781.86 : 10,739.28 = 4,245.22 : x
  2. Step 2: Convert to fraction form
    7,781.86/10,739.28 = 4,245.22/x
  3. Step 3: Cross multiply
    7,781.86x = 10,739.28 × 4,245.22
  4. Step 4: Simplify right side
    7,781.86x = 45,590,606.24
  5. Step 5: Solve for x
    x = 45,590,606.24/7,781.86
  6. Step 6: Final answer
    x = 5,858.57

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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.