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Finding the Third Proportional to 320,136 and 689,928

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Solution

The third proportional to 320,136 and 689,928 is: 1,486,870.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,136 : 689,928 = 689,928 : x
  2. Step 2: Convert to fraction form
    320,136/689,928 = 689,928/x
  3. Step 3: Cross multiply
    320,136x = 689,928 × 689,928
  4. Step 4: Simplify right side
    320,136x = 476,000,645,184
  5. Step 5: Solve for x
    x = 476,000,645,184/320,136
  6. Step 6: Final answer
    x = 1,486,870.10

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.