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Finding the Fourth Proportional to 128,336.70, 177,105.06 and 71,748.08

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Solution

The fourth proportional to 128,336.70, 177,105.06 and 71,748.08 is: 99,012.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,336.70 : 177,105.06 = 71,748.08 : x
  2. Step 2: Convert to fraction form
    128,336.70/177,105.06 = 71,748.08/x
  3. Step 3: Cross multiply
    128,336.70x = 177,105.06 × 71,748.08
  4. Step 4: Simplify right side
    128,336.70x = 12,706,948,013.28
  5. Step 5: Solve for x
    x = 12,706,948,013.28/128,336.70
  6. Step 6: Final answer
    x = 99,012.58

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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.