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Finding the Fourth Proportional to 100,368.76, 138,161.25 and 86,750.59

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Solution

The fourth proportional to 100,368.76, 138,161.25 and 86,750.59 is: 119,415.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,368.76 : 138,161.25 = 86,750.59 : x
  2. Step 2: Convert to fraction form
    100,368.76/138,161.25 = 86,750.59/x
  3. Step 3: Cross multiply
    100,368.76x = 138,161.25 × 86,750.59
  4. Step 4: Simplify right side
    100,368.76x = 11,985,569,952.64
  5. Step 5: Solve for x
    x = 11,985,569,952.64/100,368.76
  6. Step 6: Final answer
    x = 119,415.34

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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.