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Finding the Fourth Proportional to 745.64, 1,118.11 and 398.91

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Solution

The fourth proportional to 745.64, 1,118.11 and 398.91 is: 598.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.64 : 1,118.11 = 398.91 : x
  2. Step 2: Convert to fraction form
    745.64/1,118.11 = 398.91/x
  3. Step 3: Cross multiply
    745.64x = 1,118.11 × 398.91
  4. Step 4: Simplify right side
    745.64x = 446,025.26
  5. Step 5: Solve for x
    x = 446,025.26/745.64
  6. Step 6: Final answer
    x = 598.18

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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.