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Finding the Fourth Proportional to 128,708.59, 177,512.51 and 90,594.30

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Solution

The fourth proportional to 128,708.59, 177,512.51 and 90,594.30 is: 124,945.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,708.59 : 177,512.51 = 90,594.30 : x
  2. Step 2: Convert to fraction form
    128,708.59/177,512.51 = 90,594.30/x
  3. Step 3: Cross multiply
    128,708.59x = 177,512.51 × 90,594.30
  4. Step 4: Simplify right side
    128,708.59x = 16,081,621,584.69
  5. Step 5: Solve for x
    x = 16,081,621,584.69/128,708.59
  6. Step 6: Final answer
    x = 124,945.99

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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.