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Finding the Third Proportional to 531.19 and 778.13

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Solution

The third proportional to 531.19 and 778.13 is: 1,139.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.19 : 778.13 = 778.13 : x
  2. Step 2: Convert to fraction form
    531.19/778.13 = 778.13/x
  3. Step 3: Cross multiply
    531.19x = 778.13 × 778.13
  4. Step 4: Simplify right side
    531.19x = 605,478.52
  5. Step 5: Solve for x
    x = 605,478.52/531.19
  6. Step 6: Final answer
    x = 1,139.86

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.