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Finding the Fourth Proportional to 1,326.24, 1,989.44 and 749.60

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Solution

The fourth proportional to 1,326.24, 1,989.44 and 749.60 is: 1,124.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.24 : 1,989.44 = 749.60 : x
  2. Step 2: Convert to fraction form
    1,326.24/1,989.44 = 749.60/x
  3. Step 3: Cross multiply
    1,326.24x = 1,989.44 × 749.60
  4. Step 4: Simplify right side
    1,326.24x = 1,491,284.22
  5. Step 5: Solve for x
    x = 1,491,284.22/1,326.24
  6. Step 6: Final answer
    x = 1,124.45

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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.