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Finding the Fourth Proportional to 139,633.78, 207,871.26 and 138,803.40

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Solution

The fourth proportional to 139,633.78, 207,871.26 and 138,803.40 is: 206,635.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,633.78 : 207,871.26 = 138,803.40 : x
  2. Step 2: Convert to fraction form
    139,633.78/207,871.26 = 138,803.40/x
  3. Step 3: Cross multiply
    139,633.78x = 207,871.26 × 138,803.40
  4. Step 4: Simplify right side
    139,633.78x = 28,853,237,650.28
  5. Step 5: Solve for x
    x = 28,853,237,650.28/139,633.78
  6. Step 6: Final answer
    x = 206,635.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.