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Finding the Fourth Proportional to 100,884.49, 139,071.17 and 64,580.59

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Solution

The fourth proportional to 100,884.49, 139,071.17 and 64,580.59 is: 89,025.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,884.49 : 139,071.17 = 64,580.59 : x
  2. Step 2: Convert to fraction form
    100,884.49/139,071.17 = 64,580.59/x
  3. Step 3: Cross multiply
    100,884.49x = 139,071.17 × 64,580.59
  4. Step 4: Simplify right side
    100,884.49x = 8,981,297,887.69
  5. Step 5: Solve for x
    x = 8,981,297,887.69/100,884.49
  6. Step 6: Final answer
    x = 89,025.56

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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.