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Finding the Fourth Proportional to 128,480, 177,300.26 and 71,118.09

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Solution

The fourth proportional to 128,480, 177,300.26 and 71,118.09 is: 98,141.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,480 : 177,300.26 = 71,118.09 : x
  2. Step 2: Convert to fraction form
    128,480/177,300.26 = 71,118.09/x
  3. Step 3: Cross multiply
    128,480x = 177,300.26 × 71,118.09
  4. Step 4: Simplify right side
    128,480x = 12,609,255,847.70
  5. Step 5: Solve for x
    x = 12,609,255,847.70/128,480
  6. Step 6: Final answer
    x = 98,141.78

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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.