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Finding the Fourth Proportional to 100,669.70, 138,917.04 and 55,346.51

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Solution

The fourth proportional to 100,669.70, 138,917.04 and 55,346.51 is: 76,374.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,669.70 : 138,917.04 = 55,346.51 : x
  2. Step 2: Convert to fraction form
    100,669.70/138,917.04 = 55,346.51/x
  3. Step 3: Cross multiply
    100,669.70x = 138,917.04 × 55,346.51
  4. Step 4: Simplify right side
    100,669.70x = 7,688,573,483.27
  5. Step 5: Solve for x
    x = 7,688,573,483.27/100,669.70
  6. Step 6: Final answer
    x = 76,374.25

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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.