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Finding the Fourth Proportional to 100,636.48, 138,896.44 and 64,871.20

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Solution

The fourth proportional to 100,636.48, 138,896.44 and 64,871.20 is: 89,533.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,636.48 : 138,896.44 = 64,871.20 : x
  2. Step 2: Convert to fraction form
    100,636.48/138,896.44 = 64,871.20/x
  3. Step 3: Cross multiply
    100,636.48x = 138,896.44 × 64,871.20
  4. Step 4: Simplify right side
    100,636.48x = 9,010,378,738.53
  5. Step 5: Solve for x
    x = 9,010,378,738.53/100,636.48
  6. Step 6: Final answer
    x = 89,533.92

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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.