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Finding the Fourth Proportional to 100,621.45, 138,857.14 and 57,600.71

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Solution

The fourth proportional to 100,621.45, 138,857.14 and 57,600.71 is: 79,488.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,621.45 : 138,857.14 = 57,600.71 : x
  2. Step 2: Convert to fraction form
    100,621.45/138,857.14 = 57,600.71/x
  3. Step 3: Cross multiply
    100,621.45x = 138,857.14 × 57,600.71
  4. Step 4: Simplify right side
    100,621.45x = 7,998,269,014.28
  5. Step 5: Solve for x
    x = 7,998,269,014.28/100,621.45
  6. Step 6: Final answer
    x = 79,488.71

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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.