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Finding the Fourth Proportional to 101,101.80, 139,521.80 and 55,781.64

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Solution

The fourth proportional to 101,101.80, 139,521.80 and 55,781.64 is: 76,979.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,101.80 : 139,521.80 = 55,781.64 : x
  2. Step 2: Convert to fraction form
    101,101.80/139,521.80 = 55,781.64/x
  3. Step 3: Cross multiply
    101,101.80x = 139,521.80 × 55,781.64
  4. Step 4: Simplify right side
    101,101.80x = 7,782,754,819.75
  5. Step 5: Solve for x
    x = 7,782,754,819.75/101,101.80
  6. Step 6: Final answer
    x = 76,979.39

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1.5x scale

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.