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Finding the Fourth Proportional to 1,003.19, 1,504.79 and 309.86

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Solution

The fourth proportional to 1,003.19, 1,504.79 and 309.86 is: 464.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.19 : 1,504.79 = 309.86 : x
  2. Step 2: Convert to fraction form
    1,003.19/1,504.79 = 309.86/x
  3. Step 3: Cross multiply
    1,003.19x = 1,504.79 × 309.86
  4. Step 4: Simplify right side
    1,003.19x = 466,265.16
  5. Step 5: Solve for x
    x = 466,265.16/1,003.19
  6. Step 6: Final answer
    x = 464.78

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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.