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Finding the Third Proportional to 357,218 and 485,136

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Solution

The third proportional to 357,218 and 485,136 is: 658,860.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    357,218 : 485,136 = 485,136 : x
  2. Step 2: Convert to fraction form
    357,218/485,136 = 485,136/x
  3. Step 3: Cross multiply
    357,218x = 485,136 × 485,136
  4. Step 4: Simplify right side
    357,218x = 235,356,938,496
  5. Step 5: Solve for x
    x = 235,356,938,496/357,218
  6. Step 6: Final answer
    x = 658,860.80

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.