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Finding the Fourth Proportional to 100,655.64, 138,896.28 and 55,332.36

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Solution

The fourth proportional to 100,655.64, 138,896.28 and 55,332.36 is: 76,353.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,655.64 : 138,896.28 = 55,332.36 : x
  2. Step 2: Convert to fraction form
    100,655.64/138,896.28 = 55,332.36/x
  3. Step 3: Cross multiply
    100,655.64x = 138,896.28 × 55,332.36
  4. Step 4: Simplify right side
    100,655.64x = 7,685,458,967.62
  5. Step 5: Solve for x
    x = 7,685,458,967.62/100,655.64
  6. Step 6: Final answer
    x = 76,353.98

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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.