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Finding the Fourth Proportional to 139,648.32, 192,708.96 and 75,986.40

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Solution

The fourth proportional to 139,648.32, 192,708.96 and 75,986.40 is: 104,858.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,648.32 : 192,708.96 = 75,986.40 : x
  2. Step 2: Convert to fraction form
    139,648.32/192,708.96 = 75,986.40/x
  3. Step 3: Cross multiply
    139,648.32x = 192,708.96 × 75,986.40
  4. Step 4: Simplify right side
    139,648.32x = 14,643,260,118.14
  5. Step 5: Solve for x
    x = 14,643,260,118.14/139,648.32
  6. Step 6: Final answer
    x = 104,858.12

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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.