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Finding the Fourth Proportional to 139,388.16, 207,411.84 and 138,923.52

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Solution

The fourth proportional to 139,388.16, 207,411.84 and 138,923.52 is: 206,720.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,388.16 : 207,411.84 = 138,923.52 : x
  2. Step 2: Convert to fraction form
    139,388.16/207,411.84 = 138,923.52/x
  3. Step 3: Cross multiply
    139,388.16x = 207,411.84 × 138,923.52
  4. Step 4: Simplify right side
    139,388.16x = 28,814,382,902.48
  5. Step 5: Solve for x
    x = 28,814,382,902.48/139,388.16
  6. Step 6: Final answer
    x = 206,720.45

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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.