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Finding the Fourth Proportional to 101,405.85, 139,939.18 and 56,082.86

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Solution

The fourth proportional to 101,405.85, 139,939.18 and 56,082.86 is: 77,393.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,405.85 : 139,939.18 = 56,082.86 : x
  2. Step 2: Convert to fraction form
    101,405.85/139,939.18 = 56,082.86/x
  3. Step 3: Cross multiply
    101,405.85x = 139,939.18 × 56,082.86
  4. Step 4: Simplify right side
    101,405.85x = 7,848,189,440.45
  5. Step 5: Solve for x
    x = 7,848,189,440.45/101,405.85
  6. Step 6: Final answer
    x = 77,393.85

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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.