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Finding the Fourth Proportional to 128,361.70, 177,138.66 and 71,773.48

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Solution

The fourth proportional to 128,361.70, 177,138.66 and 71,773.48 is: 99,047.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,361.70 : 177,138.66 = 71,773.48 : x
  2. Step 2: Convert to fraction form
    128,361.70/177,138.66 = 71,773.48/x
  3. Step 3: Cross multiply
    128,361.70x = 177,138.66 × 71,773.48
  4. Step 4: Simplify right side
    128,361.70x = 12,713,858,070.74
  5. Step 5: Solve for x
    x = 12,713,858,070.74/128,361.70
  6. Step 6: Final answer
    x = 99,047.13

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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.