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Finding the Third Proportional to 145.55 and 309.45

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Solution

The third proportional to 145.55 and 309.45 is: 657.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.55 : 309.45 = 309.45 : x
  2. Step 2: Convert to fraction form
    145.55/309.45 = 309.45/x
  3. Step 3: Cross multiply
    145.55x = 309.45 × 309.45
  4. Step 4: Simplify right side
    145.55x = 95,756.40
  5. Step 5: Solve for x
    x = 95,756.40/145.55
  6. Step 6: Final answer
    x = 657.91

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.