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Finding the Fourth Proportional to 816.99, 1,225.50 and 509.73

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Solution

The fourth proportional to 816.99, 1,225.50 and 509.73 is: 764.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.99 : 1,225.50 = 509.73 : x
  2. Step 2: Convert to fraction form
    816.99/1,225.50 = 509.73/x
  3. Step 3: Cross multiply
    816.99x = 1,225.50 × 509.73
  4. Step 4: Simplify right side
    816.99x = 624,674.12
  5. Step 5: Solve for x
    x = 624,674.12/816.99
  6. Step 6: Final answer
    x = 764.60

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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.