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Finding the Third Proportional to 257,531.06 and 399,235.50

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Solution

The third proportional to 257,531.06 and 399,235.50 is: 618,911.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,531.06 : 399,235.50 = 399,235.50 : x
  2. Step 2: Convert to fraction form
    257,531.06/399,235.50 = 399,235.50/x
  3. Step 3: Cross multiply
    257,531.06x = 399,235.50 × 399,235.50
  4. Step 4: Simplify right side
    257,531.06x = 159,388,984,460.25
  5. Step 5: Solve for x
    x = 159,388,984,460.25/257,531.06
  6. Step 6: Final answer
    x = 618,911.69

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.