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Finding the Fourth Proportional to 100,605.60, 138,795.91 and 64,816.48

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Solution

The fourth proportional to 100,605.60, 138,795.91 and 64,816.48 is: 89,421.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,605.60 : 138,795.91 = 64,816.48 : x
  2. Step 2: Convert to fraction form
    100,605.60/138,795.91 = 64,816.48/x
  3. Step 3: Cross multiply
    100,605.60x = 138,795.91 × 64,816.48
  4. Step 4: Simplify right side
    100,605.60x = 8,996,262,324.60
  5. Step 5: Solve for x
    x = 8,996,262,324.60/100,605.60
  6. Step 6: Final answer
    x = 89,421.09

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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.