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Finding the Fourth Proportional to 139,383.65, 192,339.96 and 75,720.08

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Solution

The fourth proportional to 139,383.65, 192,339.96 and 75,720.08 is: 104,488.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,383.65 : 192,339.96 = 75,720.08 : x
  2. Step 2: Convert to fraction form
    139,383.65/192,339.96 = 75,720.08/x
  3. Step 3: Cross multiply
    139,383.65x = 192,339.96 × 75,720.08
  4. Step 4: Simplify right side
    139,383.65x = 14,563,997,158.40
  5. Step 5: Solve for x
    x = 14,563,997,158.40/139,383.65
  6. Step 6: Final answer
    x = 104,488.56

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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.