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Finding the Fourth Proportional to 7,129.37, 9,838.51 and 3,985.56

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Solution

The fourth proportional to 7,129.37, 9,838.51 and 3,985.56 is: 5,500.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.37 : 9,838.51 = 3,985.56 : x
  2. Step 2: Convert to fraction form
    7,129.37/9,838.51 = 3,985.56/x
  3. Step 3: Cross multiply
    7,129.37x = 9,838.51 × 3,985.56
  4. Step 4: Simplify right side
    7,129.37x = 39,211,971.92
  5. Step 5: Solve for x
    x = 39,211,971.92/7,129.37
  6. Step 6: Final answer
    x = 5,500.06

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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.