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Finding the Third Proportional to 1,618 and 3,985

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Solution

The third proportional to 1,618 and 3,985 is: 9,814.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,618 : 3,985 = 3,985 : x
  2. Step 2: Convert to fraction form
    1,618/3,985 = 3,985/x
  3. Step 3: Cross multiply
    1,618x = 3,985 × 3,985
  4. Step 4: Simplify right side
    1,618x = 15,880,225
  5. Step 5: Solve for x
    x = 15,880,225/1,618
  6. Step 6: Final answer
    x = 9,814.72

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Why These Related Problems?

These problems maintain the same ratio (2.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.