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Finding the Fourth Proportional to 140,659.47, 210,989.21 and 42,163.47

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Solution

The fourth proportional to 140,659.47, 210,989.21 and 42,163.47 is: 63,245.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,659.47 : 210,989.21 = 42,163.47 : x
  2. Step 2: Convert to fraction form
    140,659.47/210,989.21 = 42,163.47/x
  3. Step 3: Cross multiply
    140,659.47x = 210,989.21 × 42,163.47
  4. Step 4: Simplify right side
    140,659.47x = 8,896,037,226.16
  5. Step 5: Solve for x
    x = 8,896,037,226.16/140,659.47
  6. Step 6: Final answer
    x = 63,245.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.