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Finding the Fourth Proportional to 100,606.10, 138,796.60 and 64,816.98

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Solution

The fourth proportional to 100,606.10, 138,796.60 and 64,816.98 is: 89,421.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,606.10 : 138,796.60 = 64,816.98 : x
  2. Step 2: Convert to fraction form
    100,606.10/138,796.60 = 64,816.98/x
  3. Step 3: Cross multiply
    100,606.10x = 138,796.60 × 64,816.98
  4. Step 4: Simplify right side
    100,606.10x = 8,996,376,446.27
  5. Step 5: Solve for x
    x = 8,996,376,446.27/100,606.10
  6. Step 6: Final answer
    x = 89,421.78

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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.