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Finding the Fourth Proportional to 2,753.16, 4,129.77 and 805.40

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Solution

The fourth proportional to 2,753.16, 4,129.77 and 805.40 is: 1,208.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,753.16 : 4,129.77 = 805.40 : x
  2. Step 2: Convert to fraction form
    2,753.16/4,129.77 = 805.40/x
  3. Step 3: Cross multiply
    2,753.16x = 4,129.77 × 805.40
  4. Step 4: Simplify right side
    2,753.16x = 3,326,116.76
  5. Step 5: Solve for x
    x = 3,326,116.76/2,753.16
  6. Step 6: Final answer
    x = 1,208.11

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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.