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Finding the Fourth Proportional to 1,326.76, 1,987.79 and 805.70

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Solution

The fourth proportional to 1,326.76, 1,987.79 and 805.70 is: 1,207.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.76 : 1,987.79 = 805.70 : x
  2. Step 2: Convert to fraction form
    1,326.76/1,987.79 = 805.70/x
  3. Step 3: Cross multiply
    1,326.76x = 1,987.79 × 805.70
  4. Step 4: Simplify right side
    1,326.76x = 1,601,554.48
  5. Step 5: Solve for x
    x = 1,601,554.48/1,326.76
  6. Step 6: Final answer
    x = 1,207.12

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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.