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Finding the Fourth Proportional to 128,858.31, 177,824.30 and 72,269.19

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Solution

The fourth proportional to 128,858.31, 177,824.30 and 72,269.19 is: 99,731.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,858.31 : 177,824.30 = 72,269.19 : x
  2. Step 2: Convert to fraction form
    128,858.31/177,824.30 = 72,269.19/x
  3. Step 3: Cross multiply
    128,858.31x = 177,824.30 × 72,269.19
  4. Step 4: Simplify right side
    128,858.31x = 12,851,217,761.97
  5. Step 5: Solve for x
    x = 12,851,217,761.97/128,858.31
  6. Step 6: Final answer
    x = 99,731.39

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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.