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Finding the Fourth Proportional to 139,038.12, 191,872.80 and 75,375.90

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Solution

The fourth proportional to 139,038.12, 191,872.80 and 75,375.90 is: 104,018.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,038.12 : 191,872.80 = 75,375.90 : x
  2. Step 2: Convert to fraction form
    139,038.12/191,872.80 = 75,375.90/x
  3. Step 3: Cross multiply
    139,038.12x = 191,872.80 × 75,375.90
  4. Step 4: Simplify right side
    139,038.12x = 14,462,584,985.52
  5. Step 5: Solve for x
    x = 14,462,584,985.52/139,038.12
  6. Step 6: Final answer
    x = 104,018.85

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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.