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Finding the Fourth Proportional to 139,412.36, 192,384.78 and 75,748.80

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Solution

The fourth proportional to 139,412.36, 192,384.78 and 75,748.80 is: 104,531.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,412.36 : 192,384.78 = 75,748.80 : x
  2. Step 2: Convert to fraction form
    139,412.36/192,384.78 = 75,748.80/x
  3. Step 3: Cross multiply
    139,412.36x = 192,384.78 × 75,748.80
  4. Step 4: Simplify right side
    139,412.36x = 14,572,916,223.26
  5. Step 5: Solve for x
    x = 14,572,916,223.26/139,412.36
  6. Step 6: Final answer
    x = 104,531.02

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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.