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Finding the Third Proportional to 420.75 and 615.38

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Solution

The third proportional to 420.75 and 615.38 is: 900.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.75 : 615.38 = 615.38 : x
  2. Step 2: Convert to fraction form
    420.75/615.38 = 615.38/x
  3. Step 3: Cross multiply
    420.75x = 615.38 × 615.38
  4. Step 4: Simplify right side
    420.75x = 378,686.39
  5. Step 5: Solve for x
    x = 378,686.39/420.75
  6. Step 6: Final answer
    x = 900.03

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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.