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Finding the Fourth Proportional to 745.49, 1,118.88 and 399.11

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Solution

The fourth proportional to 745.49, 1,118.88 and 399.11 is: 599.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.49 : 1,118.88 = 399.11 : x
  2. Step 2: Convert to fraction form
    745.49/1,118.88 = 399.11/x
  3. Step 3: Cross multiply
    745.49x = 1,118.88 × 399.11
  4. Step 4: Simplify right side
    745.49x = 446,550.60
  5. Step 5: Solve for x
    x = 446,550.60/745.49
  6. Step 6: Final answer
    x = 599.01

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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.