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Finding the Fourth Proportional to 139,953.42, 209,963.21 and 55,718.42

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Solution

The fourth proportional to 139,953.42, 209,963.21 and 55,718.42 is: 83,590.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,953.42 : 209,963.21 = 55,718.42 : x
  2. Step 2: Convert to fraction form
    139,953.42/209,963.21 = 55,718.42/x
  3. Step 3: Cross multiply
    139,953.42x = 209,963.21 × 55,718.42
  4. Step 4: Simplify right side
    139,953.42x = 11,698,816,990.92
  5. Step 5: Solve for x
    x = 11,698,816,990.92/139,953.42
  6. Step 6: Final answer
    x = 83,590.79

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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.