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Finding the Third Proportional to 916.31 and 1,378.90

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Solution

The third proportional to 916.31 and 1,378.90 is: 2,075.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.31 : 1,378.90 = 1,378.90 : x
  2. Step 2: Convert to fraction form
    916.31/1,378.90 = 1,378.90/x
  3. Step 3: Cross multiply
    916.31x = 1,378.90 × 1,378.90
  4. Step 4: Simplify right side
    916.31x = 1,901,360.90
  5. Step 5: Solve for x
    x = 1,901,360.90/916.31
  6. Step 6: Final answer
    x = 2,075.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.