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Finding the Fourth Proportional to 100,791.32, 139,045.47 and 64,992.80

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Solution

The fourth proportional to 100,791.32, 139,045.47 and 64,992.80 is: 89,660.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,791.32 : 139,045.47 = 64,992.80 : x
  2. Step 2: Convert to fraction form
    100,791.32/139,045.47 = 64,992.80/x
  3. Step 3: Cross multiply
    100,791.32x = 139,045.47 × 64,992.80
  4. Step 4: Simplify right side
    100,791.32x = 9,036,954,422.62
  5. Step 5: Solve for x
    x = 9,036,954,422.62/100,791.32
  6. Step 6: Final answer
    x = 89,660.05

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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.