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Finding the Fourth Proportional to 101,357.28, 139,873.05 and 56,645.28

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Solution

The fourth proportional to 101,357.28, 139,873.05 and 56,645.28 is: 78,170.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,357.28 : 139,873.05 = 56,645.28 : x
  2. Step 2: Convert to fraction form
    101,357.28/139,873.05 = 56,645.28/x
  3. Step 3: Cross multiply
    101,357.28x = 139,873.05 × 56,645.28
  4. Step 4: Simplify right side
    101,357.28x = 7,923,148,081.70
  5. Step 5: Solve for x
    x = 7,923,148,081.70/101,357.28
  6. Step 6: Final answer
    x = 78,170.49

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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.