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Finding the Fourth Proportional to 259,969.30, 389,953.95 and 82,490.20

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Solution

The fourth proportional to 259,969.30, 389,953.95 and 82,490.20 is: 123,735.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,969.30 : 389,953.95 = 82,490.20 : x
  2. Step 2: Convert to fraction form
    259,969.30/389,953.95 = 82,490.20/x
  3. Step 3: Cross multiply
    259,969.30x = 389,953.95 × 82,490.20
  4. Step 4: Simplify right side
    259,969.30x = 32,167,379,326.29
  5. Step 5: Solve for x
    x = 32,167,379,326.29/259,969.30
  6. Step 6: Final answer
    x = 123,735.30

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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.