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Finding the Fourth Proportional to 128,611.98, 177,345.90 and 87,780.69

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Solution

The fourth proportional to 128,611.98, 177,345.90 and 87,780.69 is: 121,042.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,611.98 : 177,345.90 = 87,780.69 : x
  2. Step 2: Convert to fraction form
    128,611.98/177,345.90 = 87,780.69/x
  3. Step 3: Cross multiply
    128,611.98x = 177,345.90 × 87,780.69
  4. Step 4: Simplify right side
    128,611.98x = 15,567,545,470.67
  5. Step 5: Solve for x
    x = 15,567,545,470.67/128,611.98
  6. Step 6: Final answer
    x = 121,042.73

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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.