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Finding the Fourth Proportional to 121,537.60, 181,917.60 and 86,545.60

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Solution

The fourth proportional to 121,537.60, 181,917.60 and 86,545.60 is: 129,541.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,537.60 : 181,917.60 = 86,545.60 : x
  2. Step 2: Convert to fraction form
    121,537.60/181,917.60 = 86,545.60/x
  3. Step 3: Cross multiply
    121,537.60x = 181,917.60 × 86,545.60
  4. Step 4: Simplify right side
    121,537.60x = 15,744,167,842.56
  5. Step 5: Solve for x
    x = 15,744,167,842.56/121,537.60
  6. Step 6: Final answer
    x = 129,541.54

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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.