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Finding the Fourth Proportional to 745.74, 1,117.80 and 398.82

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Solution

The fourth proportional to 745.74, 1,117.80 and 398.82 is: 597.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.74 : 1,117.80 = 398.82 : x
  2. Step 2: Convert to fraction form
    745.74/1,117.80 = 398.82/x
  3. Step 3: Cross multiply
    745.74x = 1,117.80 × 398.82
  4. Step 4: Simplify right side
    745.74x = 445,801.00
  5. Step 5: Solve for x
    x = 445,801.00/745.74
  6. Step 6: Final answer
    x = 597.80

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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.