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Finding the Third Proportional to 618 and 988.13

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Solution

The third proportional to 618 and 988.13 is: 1,579.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    618 : 988.13 = 988.13 : x
  2. Step 2: Convert to fraction form
    618/988.13 = 988.13/x
  3. Step 3: Cross multiply
    618x = 988.13 × 988.13
  4. Step 4: Simplify right side
    618x = 976,391.02
  5. Step 5: Solve for x
    x = 976,391.02/618
  6. Step 6: Final answer
    x = 1,579.92

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.