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Finding the Fourth Proportional to 138,987.68, 208,479.78 and 33,806.72

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Solution

The fourth proportional to 138,987.68, 208,479.78 and 33,806.72 is: 50,709.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,987.68 : 208,479.78 = 33,806.72 : x
  2. Step 2: Convert to fraction form
    138,987.68/208,479.78 = 33,806.72/x
  3. Step 3: Cross multiply
    138,987.68x = 208,479.78 × 33,806.72
  4. Step 4: Simplify right side
    138,987.68x = 7,048,017,548.12
  5. Step 5: Solve for x
    x = 7,048,017,548.12/138,987.68
  6. Step 6: Final answer
    x = 50,709.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.