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Finding the Fourth Proportional to 128,760.98, 177,624.10 and 77,745.56

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Solution

The fourth proportional to 128,760.98, 177,624.10 and 77,745.56 is: 107,248.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,760.98 : 177,624.10 = 77,745.56 : x
  2. Step 2: Convert to fraction form
    128,760.98/177,624.10 = 77,745.56/x
  3. Step 3: Cross multiply
    128,760.98x = 177,624.10 × 77,745.56
  4. Step 4: Simplify right side
    128,760.98x = 13,809,485,124.00
  5. Step 5: Solve for x
    x = 13,809,485,124.00/128,760.98
  6. Step 6: Final answer
    x = 107,248.99

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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.