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Finding the Fourth Proportional to 1,326.16, 1,987.08 and 676

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Solution

The fourth proportional to 1,326.16, 1,987.08 and 676 is: 1,012.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.16 : 1,987.08 = 676 : x
  2. Step 2: Convert to fraction form
    1,326.16/1,987.08 = 676/x
  3. Step 3: Cross multiply
    1,326.16x = 1,987.08 × 676
  4. Step 4: Simplify right side
    1,326.16x = 1,343,266.08
  5. Step 5: Solve for x
    x = 1,343,266.08/1,326.16
  6. Step 6: Final answer
    x = 1,012.90

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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.