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Finding the Fourth Proportional to 1,002.42, 1,503.81 and 309.15

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Solution

The fourth proportional to 1,002.42, 1,503.81 and 309.15 is: 463.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.42 : 1,503.81 = 309.15 : x
  2. Step 2: Convert to fraction form
    1,002.42/1,503.81 = 309.15/x
  3. Step 3: Cross multiply
    1,002.42x = 1,503.81 × 309.15
  4. Step 4: Simplify right side
    1,002.42x = 464,902.86
  5. Step 5: Solve for x
    x = 464,902.86/1,002.42
  6. Step 6: Final answer
    x = 463.78

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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.