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Finding the Third Proportional to 421 and 666.50

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Solution

The third proportional to 421 and 666.50 is: 1,055.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    421 : 666.50 = 666.50 : x
  2. Step 2: Convert to fraction form
    421/666.50 = 666.50/x
  3. Step 3: Cross multiply
    421x = 666.50 × 666.50
  4. Step 4: Simplify right side
    421x = 444,222.25
  5. Step 5: Solve for x
    x = 444,222.25/421
  6. Step 6: Final answer
    x = 1,055.16

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.