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Finding the Third Proportional to 553 and 786.50

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Solution

The third proportional to 553 and 786.50 is: 1,118.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    553 : 786.50 = 786.50 : x
  2. Step 2: Convert to fraction form
    553/786.50 = 786.50/x
  3. Step 3: Cross multiply
    553x = 786.50 × 786.50
  4. Step 4: Simplify right side
    553x = 618,582.25
  5. Step 5: Solve for x
    x = 618,582.25/553
  6. Step 6: Final answer
    x = 1,118.59

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.