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Finding the Fourth Proportional to 139,427.52, 192,417.32 and 79,009.88

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Solution

The fourth proportional to 139,427.52, 192,417.32 and 79,009.88 is: 109,037.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,427.52 : 192,417.32 = 79,009.88 : x
  2. Step 2: Convert to fraction form
    139,427.52/192,417.32 = 79,009.88/x
  3. Step 3: Cross multiply
    139,427.52x = 192,417.32 × 79,009.88
  4. Step 4: Simplify right side
    139,427.52x = 15,202,869,363.12
  5. Step 5: Solve for x
    x = 15,202,869,363.12/139,427.52
  6. Step 6: Final answer
    x = 109,037.80

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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.