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Finding the Fourth Proportional to 745.13, 1,117.36 and 398.41

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Solution

The fourth proportional to 745.13, 1,117.36 and 398.41 is: 597.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.13 : 1,117.36 = 398.41 : x
  2. Step 2: Convert to fraction form
    745.13/1,117.36 = 398.41/x
  3. Step 3: Cross multiply
    745.13x = 1,117.36 × 398.41
  4. Step 4: Simplify right side
    745.13x = 445,165.10
  5. Step 5: Solve for x
    x = 445,165.10/745.13
  6. Step 6: Final answer
    x = 597.43

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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.