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Finding the Fourth Proportional to 139,418.34, 192,448.08 and 85,775.28

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Solution

The fourth proportional to 139,418.34, 192,448.08 and 85,775.28 is: 118,401.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,418.34 : 192,448.08 = 85,775.28 : x
  2. Step 2: Convert to fraction form
    139,418.34/192,448.08 = 85,775.28/x
  3. Step 3: Cross multiply
    139,418.34x = 192,448.08 × 85,775.28
  4. Step 4: Simplify right side
    139,418.34x = 16,507,287,947.46
  5. Step 5: Solve for x
    x = 16,507,287,947.46/139,418.34
  6. Step 6: Final answer
    x = 118,401.12

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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.