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Finding the Fourth Proportional to 100,790.31, 139,090.65 and 55,468.28

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Solution

The fourth proportional to 100,790.31, 139,090.65 and 55,468.28 is: 76,546.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,790.31 : 139,090.65 = 55,468.28 : x
  2. Step 2: Convert to fraction form
    100,790.31/139,090.65 = 55,468.28/x
  3. Step 3: Cross multiply
    100,790.31x = 139,090.65 × 55,468.28
  4. Step 4: Simplify right side
    100,790.31x = 7,715,119,119.58
  5. Step 5: Solve for x
    x = 7,715,119,119.58/100,790.31
  6. Step 6: Final answer
    x = 76,546.24

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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.