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Finding the Fourth Proportional to 101,438.37, 139,989.07 and 56,115.57

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Solution

The fourth proportional to 101,438.37, 139,989.07 and 56,115.57 is: 77,441.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,438.37 : 139,989.07 = 56,115.57 : x
  2. Step 2: Convert to fraction form
    101,438.37/139,989.07 = 56,115.57/x
  3. Step 3: Cross multiply
    101,438.37x = 139,989.07 × 56,115.57
  4. Step 4: Simplify right side
    101,438.37x = 7,855,566,456.82
  5. Step 5: Solve for x
    x = 7,855,566,456.82/101,438.37
  6. Step 6: Final answer
    x = 77,441.77

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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.