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Finding the Fourth Proportional to 1,326.46, 1,987.47 and 667.45

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Solution

The fourth proportional to 1,326.46, 1,987.47 and 667.45 is: 1,000.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.46 : 1,987.47 = 667.45 : x
  2. Step 2: Convert to fraction form
    1,326.46/1,987.47 = 667.45/x
  3. Step 3: Cross multiply
    1,326.46x = 1,987.47 × 667.45
  4. Step 4: Simplify right side
    1,326.46x = 1,326,536.85
  5. Step 5: Solve for x
    x = 1,326,536.85/1,326.46
  6. Step 6: Final answer
    x = 1,000.06

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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.