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Finding the Fourth Proportional to 101,085.78, 139,496.64 and 55,768.11

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Solution

The fourth proportional to 101,085.78, 139,496.64 and 55,768.11 is: 76,959.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,085.78 : 139,496.64 = 55,768.11 : x
  2. Step 2: Convert to fraction form
    101,085.78/139,496.64 = 55,768.11/x
  3. Step 3: Cross multiply
    101,085.78x = 139,496.64 × 55,768.11
  4. Step 4: Simplify right side
    101,085.78x = 7,779,463,964.15
  5. Step 5: Solve for x
    x = 7,779,463,964.15/101,085.78
  6. Step 6: Final answer
    x = 76,959.03

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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.