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Finding the Fourth Proportional to 1,002.12, 1,503.18 and 261.73

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Solution

The fourth proportional to 1,002.12, 1,503.18 and 261.73 is: 392.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.12 : 1,503.18 = 261.73 : x
  2. Step 2: Convert to fraction form
    1,002.12/1,503.18 = 261.73/x
  3. Step 3: Cross multiply
    1,002.12x = 1,503.18 × 261.73
  4. Step 4: Simplify right side
    1,002.12x = 393,430.67
  5. Step 5: Solve for x
    x = 393,430.67/1,002.12
  6. Step 6: Final answer
    x = 392.60

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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.