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Finding the Fourth Proportional to 1,002.39, 1,503.31 and 386.12

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Solution

The fourth proportional to 1,002.39, 1,503.31 and 386.12 is: 579.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.39 : 1,503.31 = 386.12 : x
  2. Step 2: Convert to fraction form
    1,002.39/1,503.31 = 386.12/x
  3. Step 3: Cross multiply
    1,002.39x = 1,503.31 × 386.12
  4. Step 4: Simplify right side
    1,002.39x = 580,458.06
  5. Step 5: Solve for x
    x = 580,458.06/1,002.39
  6. Step 6: Final answer
    x = 579.07

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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.