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Finding the Fourth Proportional to 139,388.72, 192,344.48 and 77,301.20

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Solution

The fourth proportional to 139,388.72, 192,344.48 and 77,301.20 is: 106,669.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,388.72 : 192,344.48 = 77,301.20 : x
  2. Step 2: Convert to fraction form
    139,388.72/192,344.48 = 77,301.20/x
  3. Step 3: Cross multiply
    139,388.72x = 192,344.48 × 77,301.20
  4. Step 4: Simplify right side
    139,388.72x = 14,868,457,769.15
  5. Step 5: Solve for x
    x = 14,868,457,769.15/139,388.72
  6. Step 6: Final answer
    x = 106,669.02

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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.