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Finding the Fourth Proportional to 101,134.81, 139,565.87 and 55,812.78

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Solution

The fourth proportional to 101,134.81, 139,565.87 and 55,812.78 is: 77,021.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,134.81 : 139,565.87 = 55,812.78 : x
  2. Step 2: Convert to fraction form
    101,134.81/139,565.87 = 55,812.78/x
  3. Step 3: Cross multiply
    101,134.81x = 139,565.87 × 55,812.78
  4. Step 4: Simplify right side
    101,134.81x = 7,789,559,128.05
  5. Step 5: Solve for x
    x = 7,789,559,128.05/101,134.81
  6. Step 6: Final answer
    x = 77,021.54

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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.