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Finding the Fourth Proportional to 101,207.87, 139,720.24 and 65,418.22

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Solution

The fourth proportional to 101,207.87, 139,720.24 and 65,418.22 is: 90,311.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,207.87 : 139,720.24 = 65,418.22 : x
  2. Step 2: Convert to fraction form
    101,207.87/139,720.24 = 65,418.22/x
  3. Step 3: Cross multiply
    101,207.87x = 139,720.24 × 65,418.22
  4. Step 4: Simplify right side
    101,207.87x = 9,140,249,398.77
  5. Step 5: Solve for x
    x = 9,140,249,398.77/101,207.87
  6. Step 6: Final answer
    x = 90,311.65

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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.