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Finding the Fourth Proportional to 1,287.66, 1,780.47 and 1,266.82

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Solution

The fourth proportional to 1,287.66, 1,780.47 and 1,266.82 is: 1,751.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.66 : 1,780.47 = 1,266.82 : x
  2. Step 2: Convert to fraction form
    1,287.66/1,780.47 = 1,266.82/x
  3. Step 3: Cross multiply
    1,287.66x = 1,780.47 × 1,266.82
  4. Step 4: Simplify right side
    1,287.66x = 2,255,530.55
  5. Step 5: Solve for x
    x = 2,255,530.55/1,287.66
  6. Step 6: Final answer
    x = 1,751.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.