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Finding the Third Proportional to 405.56 and 711.56

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Solution

The third proportional to 405.56 and 711.56 is: 1,248.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.56 : 711.56 = 711.56 : x
  2. Step 2: Convert to fraction form
    405.56/711.56 = 711.56/x
  3. Step 3: Cross multiply
    405.56x = 711.56 × 711.56
  4. Step 4: Simplify right side
    405.56x = 506,321.19
  5. Step 5: Solve for x
    x = 506,321.19/405.56
  6. Step 6: Final answer
    x = 1,248.44

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Why These Related Problems?

These problems maintain the same ratio (1.75) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.