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Finding the Fourth Proportional to 100,805.78, 139,054.03 and 63,014.42

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Solution

The fourth proportional to 100,805.78, 139,054.03 and 63,014.42 is: 86,923.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,805.78 : 139,054.03 = 63,014.42 : x
  2. Step 2: Convert to fraction form
    100,805.78/139,054.03 = 63,014.42/x
  3. Step 3: Cross multiply
    100,805.78x = 139,054.03 × 63,014.42
  4. Step 4: Simplify right side
    100,805.78x = 8,762,409,049.11
  5. Step 5: Solve for x
    x = 8,762,409,049.11/100,805.78
  6. Step 6: Final answer
    x = 86,923.68

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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.