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Finding the Fourth Proportional to 100,369.76, 138,162.62 and 86,751.60

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Solution

The fourth proportional to 100,369.76, 138,162.62 and 86,751.60 is: 119,416.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,369.76 : 138,162.62 = 86,751.60 : x
  2. Step 2: Convert to fraction form
    100,369.76/138,162.62 = 86,751.60/x
  3. Step 3: Cross multiply
    100,369.76x = 138,162.62 × 86,751.60
  4. Step 4: Simplify right side
    100,369.76x = 11,985,828,345.19
  5. Step 5: Solve for x
    x = 11,985,828,345.19/100,369.76
  6. Step 6: Final answer
    x = 119,416.73

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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.