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Finding the Fourth Proportional to 814.70, 1,219.62 and 553.20

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Solution

The fourth proportional to 814.70, 1,219.62 and 553.20 is: 828.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.70 : 1,219.62 = 553.20 : x
  2. Step 2: Convert to fraction form
    814.70/1,219.62 = 553.20/x
  3. Step 3: Cross multiply
    814.70x = 1,219.62 × 553.20
  4. Step 4: Simplify right side
    814.70x = 674,693.78
  5. Step 5: Solve for x
    x = 674,693.78/814.70
  6. Step 6: Final answer
    x = 828.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.