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Finding the Fourth Proportional to 745.15, 1,117.32 and 398.89

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Solution

The fourth proportional to 745.15, 1,117.32 and 398.89 is: 598.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.15 : 1,117.32 = 398.89 : x
  2. Step 2: Convert to fraction form
    745.15/1,117.32 = 398.89/x
  3. Step 3: Cross multiply
    745.15x = 1,117.32 × 398.89
  4. Step 4: Simplify right side
    745.15x = 445,687.77
  5. Step 5: Solve for x
    x = 445,687.77/745.15
  6. Step 6: Final answer
    x = 598.12

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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.