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Finding the Fourth Proportional to 128,778.06, 177,713.01 and 72,188.22

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Solution

The fourth proportional to 128,778.06, 177,713.01 and 72,188.22 is: 99,619.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,778.06 : 177,713.01 = 72,188.22 : x
  2. Step 2: Convert to fraction form
    128,778.06/177,713.01 = 72,188.22/x
  3. Step 3: Cross multiply
    128,778.06x = 177,713.01 × 72,188.22
  4. Step 4: Simplify right side
    128,778.06x = 12,828,785,862.74
  5. Step 5: Solve for x
    x = 12,828,785,862.74/128,778.06
  6. Step 6: Final answer
    x = 99,619.34

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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.