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Finding the Fourth Proportional to 92,012.70, 138,051.45 and 39,438.30

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Solution

The fourth proportional to 92,012.70, 138,051.45 and 39,438.30 is: 59,171.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,012.70 : 138,051.45 = 39,438.30 : x
  2. Step 2: Convert to fraction form
    92,012.70/138,051.45 = 39,438.30/x
  3. Step 3: Cross multiply
    92,012.70x = 138,051.45 × 39,438.30
  4. Step 4: Simplify right side
    92,012.70x = 5,444,514,500.54
  5. Step 5: Solve for x
    x = 5,444,514,500.54/92,012.70
  6. Step 6: Final answer
    x = 59,171.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.