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Finding the Third Proportional to 257,992 and 390,880

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Solution

The third proportional to 257,992 and 390,880 is: 592,216.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,992 : 390,880 = 390,880 : x
  2. Step 2: Convert to fraction form
    257,992/390,880 = 390,880/x
  3. Step 3: Cross multiply
    257,992x = 390,880 × 390,880
  4. Step 4: Simplify right side
    257,992x = 152,787,174,400
  5. Step 5: Solve for x
    x = 152,787,174,400/257,992
  6. Step 6: Final answer
    x = 592,216.71

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.