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Finding the Fourth Proportional to 138,813.94, 208,220.84 and 45,319.69

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Solution

The fourth proportional to 138,813.94, 208,220.84 and 45,319.69 is: 67,979.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,813.94 : 208,220.84 = 45,319.69 : x
  2. Step 2: Convert to fraction form
    138,813.94/208,220.84 = 45,319.69/x
  3. Step 3: Cross multiply
    138,813.94x = 208,220.84 × 45,319.69
  4. Step 4: Simplify right side
    138,813.94x = 9,436,503,920.34
  5. Step 5: Solve for x
    x = 9,436,503,920.34/138,813.94
  6. Step 6: Final answer
    x = 67,979.51

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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.