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Finding the Fourth Proportional to 128,511.98, 192,777.71 and 39,774.46

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Solution

The fourth proportional to 128,511.98, 192,777.71 and 39,774.46 is: 59,664.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,511.98 : 192,777.71 = 39,774.46 : x
  2. Step 2: Convert to fraction form
    128,511.98/192,777.71 = 39,774.46/x
  3. Step 3: Cross multiply
    128,511.98x = 192,777.71 × 39,774.46
  4. Step 4: Simplify right side
    128,511.98x = 7,667,629,315.29
  5. Step 5: Solve for x
    x = 7,667,629,315.29/128,511.98
  6. Step 6: Final answer
    x = 59,664.70

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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.