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Finding the Fourth Proportional to 100,369.01, 138,161.59 and 86,750.85

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Solution

The fourth proportional to 100,369.01, 138,161.59 and 86,750.85 is: 119,415.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,369.01 : 138,161.59 = 86,750.85 : x
  2. Step 2: Convert to fraction form
    100,369.01/138,161.59 = 86,750.85/x
  3. Step 3: Cross multiply
    100,369.01x = 138,161.59 × 86,750.85
  4. Step 4: Simplify right side
    100,369.01x = 11,985,634,936.10
  5. Step 5: Solve for x
    x = 11,985,634,936.10/100,369.01
  6. Step 6: Final answer
    x = 119,415.69

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1.5x scale

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.