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Finding the Fourth Proportional to 100,709.94, 138,981.93 and 55,390.21

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Solution

The fourth proportional to 100,709.94, 138,981.93 and 55,390.21 is: 76,439.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,709.94 : 138,981.93 = 55,390.21 : x
  2. Step 2: Convert to fraction form
    100,709.94/138,981.93 = 55,390.21/x
  3. Step 3: Cross multiply
    100,709.94x = 138,981.93 × 55,390.21
  4. Step 4: Simplify right side
    100,709.94x = 7,698,238,288.91
  5. Step 5: Solve for x
    x = 7,698,238,288.91/100,709.94
  6. Step 6: Final answer
    x = 76,439.71

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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.