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Finding the Fourth Proportional to 1,272.06, 1,904.49 and 808.69

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Solution

The fourth proportional to 1,272.06, 1,904.49 and 808.69 is: 1,210.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.06 : 1,904.49 = 808.69 : x
  2. Step 2: Convert to fraction form
    1,272.06/1,904.49 = 808.69/x
  3. Step 3: Cross multiply
    1,272.06x = 1,904.49 × 808.69
  4. Step 4: Simplify right side
    1,272.06x = 1,540,137.26
  5. Step 5: Solve for x
    x = 1,540,137.26/1,272.06
  6. Step 6: Final answer
    x = 1,210.74

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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.