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Finding the Fourth Proportional to 101,038.74, 139,441.41 and 55,720.86

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Solution

The fourth proportional to 101,038.74, 139,441.41 and 55,720.86 is: 76,899.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,038.74 : 139,441.41 = 55,720.86 : x
  2. Step 2: Convert to fraction form
    101,038.74/139,441.41 = 55,720.86/x
  3. Step 3: Cross multiply
    101,038.74x = 139,441.41 × 55,720.86
  4. Step 4: Simplify right side
    101,038.74x = 7,769,795,284.81
  5. Step 5: Solve for x
    x = 7,769,795,284.81/101,038.74
  6. Step 6: Final answer
    x = 76,899.17

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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.