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Finding the Fourth Proportional to 101,121.12, 139,591.80 and 65,328.48

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Solution

The fourth proportional to 101,121.12, 139,591.80 and 65,328.48 is: 90,182.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,121.12 : 139,591.80 = 65,328.48 : x
  2. Step 2: Convert to fraction form
    101,121.12/139,591.80 = 65,328.48/x
  3. Step 3: Cross multiply
    101,121.12x = 139,591.80 × 65,328.48
  4. Step 4: Simplify right side
    101,121.12x = 9,119,320,114.46
  5. Step 5: Solve for x
    x = 9,119,320,114.46/101,121.12
  6. Step 6: Final answer
    x = 90,182.15

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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.