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Finding the Fourth Proportional to 128,703.74, 177,628.55 and 75,005.60

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Solution

The fourth proportional to 128,703.74, 177,628.55 and 75,005.60 is: 103,517.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,703.74 : 177,628.55 = 75,005.60 : x
  2. Step 2: Convert to fraction form
    128,703.74/177,628.55 = 75,005.60/x
  3. Step 3: Cross multiply
    128,703.74x = 177,628.55 × 75,005.60
  4. Step 4: Simplify right side
    128,703.74x = 13,323,134,706.71
  5. Step 5: Solve for x
    x = 13,323,134,706.71/128,703.74
  6. Step 6: Final answer
    x = 103,517.86

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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.