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Finding the Third Proportional to 405,942 and 618,488

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Solution

The third proportional to 405,942 and 618,488 is: 942,320.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,942 : 618,488 = 618,488 : x
  2. Step 2: Convert to fraction form
    405,942/618,488 = 618,488/x
  3. Step 3: Cross multiply
    405,942x = 618,488 × 618,488
  4. Step 4: Simplify right side
    405,942x = 382,527,406,144
  5. Step 5: Solve for x
    x = 382,527,406,144/405,942
  6. Step 6: Final answer
    x = 942,320.35

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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.