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Finding the Third Proportional to 531.75 and 780.13

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Solution

The third proportional to 531.75 and 780.13 is: 1,144.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.75 : 780.13 = 780.13 : x
  2. Step 2: Convert to fraction form
    531.75/780.13 = 780.13/x
  3. Step 3: Cross multiply
    531.75x = 780.13 × 780.13
  4. Step 4: Simplify right side
    531.75x = 608,595.02
  5. Step 5: Solve for x
    x = 608,595.02/531.75
  6. Step 6: Final answer
    x = 1,144.51

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.