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Finding the Fourth Proportional to 7,129.68, 9,838.74 and 3,985.86

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Solution

The fourth proportional to 7,129.68, 9,838.74 and 3,985.86 is: 5,500.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.68 : 9,838.74 = 3,985.86 : x
  2. Step 2: Convert to fraction form
    7,129.68/9,838.74 = 3,985.86/x
  3. Step 3: Cross multiply
    7,129.68x = 9,838.74 × 3,985.86
  4. Step 4: Simplify right side
    7,129.68x = 39,215,840.22
  5. Step 5: Solve for x
    x = 39,215,840.22/7,129.68
  6. Step 6: Final answer
    x = 5,500.36

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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.