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Finding the Third Proportional to 257,704.50 and 390,121.50

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Solution

The third proportional to 257,704.50 and 390,121.50 is: 590,578.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,704.50 : 390,121.50 = 390,121.50 : x
  2. Step 2: Convert to fraction form
    257,704.50/390,121.50 = 390,121.50/x
  3. Step 3: Cross multiply
    257,704.50x = 390,121.50 × 390,121.50
  4. Step 4: Simplify right side
    257,704.50x = 152,194,784,762.25
  5. Step 5: Solve for x
    x = 152,194,784,762.25/257,704.50
  6. Step 6: Final answer
    x = 590,578.69

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.