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Finding the Fourth Proportional to 120,920.13, 166,870.65 and 66,473.31

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Solution

The fourth proportional to 120,920.13, 166,870.65 and 66,473.31 is: 91,733.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,920.13 : 166,870.65 = 66,473.31 : x
  2. Step 2: Convert to fraction form
    120,920.13/166,870.65 = 66,473.31/x
  3. Step 3: Cross multiply
    120,920.13x = 166,870.65 × 66,473.31
  4. Step 4: Simplify right side
    120,920.13x = 11,092,444,447.35
  5. Step 5: Solve for x
    x = 11,092,444,447.35/120,920.13
  6. Step 6: Final answer
    x = 91,733.65

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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.