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Finding the Third Proportional to 420,240 and 630,790

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Solution

The third proportional to 420,240 and 630,790 is: 946,830.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,240 : 630,790 = 630,790 : x
  2. Step 2: Convert to fraction form
    420,240/630,790 = 630,790/x
  3. Step 3: Cross multiply
    420,240x = 630,790 × 630,790
  4. Step 4: Simplify right side
    420,240x = 397,896,024,100
  5. Step 5: Solve for x
    x = 397,896,024,100/420,240
  6. Step 6: Final answer
    x = 946,830.44

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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.