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Finding the Fourth Proportional to 1,326.72, 1,991.62 and 711.63

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Solution

The fourth proportional to 1,326.72, 1,991.62 and 711.63 is: 1,068.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.72 : 1,991.62 = 711.63 : x
  2. Step 2: Convert to fraction form
    1,326.72/1,991.62 = 711.63/x
  3. Step 3: Cross multiply
    1,326.72x = 1,991.62 × 711.63
  4. Step 4: Simplify right side
    1,326.72x = 1,417,287.29
  5. Step 5: Solve for x
    x = 1,417,287.29/1,326.72
  6. Step 6: Final answer
    x = 1,068.26

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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.