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Finding the Third Proportional to 390.13 and 587.63

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Solution

The third proportional to 390.13 and 587.63 is: 885.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.13 : 587.63 = 587.63 : x
  2. Step 2: Convert to fraction form
    390.13/587.63 = 587.63/x
  3. Step 3: Cross multiply
    390.13x = 587.63 × 587.63
  4. Step 4: Simplify right side
    390.13x = 345,303.14
  5. Step 5: Solve for x
    x = 345,303.14/390.13
  6. Step 6: Final answer
    x = 885.11

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.