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Finding the Fourth Proportional to 138,429.90, 191,041.20 and 84,699.90

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Solution

The fourth proportional to 138,429.90, 191,041.20 and 84,699.90 is: 116,890.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,429.90 : 191,041.20 = 84,699.90 : x
  2. Step 2: Convert to fraction form
    138,429.90/191,041.20 = 84,699.90/x
  3. Step 3: Cross multiply
    138,429.90x = 191,041.20 × 84,699.90
  4. Step 4: Simplify right side
    138,429.90x = 16,181,170,535.88
  5. Step 5: Solve for x
    x = 16,181,170,535.88/138,429.90
  6. Step 6: Final answer
    x = 116,890.72

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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.