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Finding the Fourth Proportional to 171,642.59, 257,420.84 and 81,629.78

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Solution

The fourth proportional to 171,642.59, 257,420.84 and 81,629.78 is: 122,424.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,642.59 : 257,420.84 = 81,629.78 : x
  2. Step 2: Convert to fraction form
    171,642.59/257,420.84 = 81,629.78/x
  3. Step 3: Cross multiply
    171,642.59x = 257,420.84 × 81,629.78
  4. Step 4: Simplify right side
    171,642.59x = 21,013,204,841.36
  5. Step 5: Solve for x
    x = 21,013,204,841.36/171,642.59
  6. Step 6: Final answer
    x = 122,424.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.