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Finding the Fourth Proportional to 1,326.48, 1,989.72 and 711.36

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Solution

The fourth proportional to 1,326.48, 1,989.72 and 711.36 is: 1,067.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.48 : 1,989.72 = 711.36 : x
  2. Step 2: Convert to fraction form
    1,326.48/1,989.72 = 711.36/x
  3. Step 3: Cross multiply
    1,326.48x = 1,989.72 × 711.36
  4. Step 4: Simplify right side
    1,326.48x = 1,415,407.22
  5. Step 5: Solve for x
    x = 1,415,407.22/1,326.48
  6. Step 6: Final answer
    x = 1,067.04

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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.