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Finding the Third Proportional to 438.13 and 916.81

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Solution

The third proportional to 438.13 and 916.81 is: 1,918.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.13 : 916.81 = 916.81 : x
  2. Step 2: Convert to fraction form
    438.13/916.81 = 916.81/x
  3. Step 3: Cross multiply
    438.13x = 916.81 × 916.81
  4. Step 4: Simplify right side
    438.13x = 840,545.16
  5. Step 5: Solve for x
    x = 840,545.16/438.13
  6. Step 6: Final answer
    x = 1,918.51

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.