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Finding the Fourth Proportional to 3,145.30, 4,717.95 and 805.30

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Solution

The fourth proportional to 3,145.30, 4,717.95 and 805.30 is: 1,207.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,145.30 : 4,717.95 = 805.30 : x
  2. Step 2: Convert to fraction form
    3,145.30/4,717.95 = 805.30/x
  3. Step 3: Cross multiply
    3,145.30x = 4,717.95 × 805.30
  4. Step 4: Simplify right side
    3,145.30x = 3,799,365.14
  5. Step 5: Solve for x
    x = 3,799,365.14/3,145.30
  6. Step 6: Final answer
    x = 1,207.95

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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.