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Finding the Fourth Proportional to 745.26, 1,116.96 and 398.40

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Solution

The fourth proportional to 745.26, 1,116.96 and 398.40 is: 597.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.26 : 1,116.96 = 398.40 : x
  2. Step 2: Convert to fraction form
    745.26/1,116.96 = 398.40/x
  3. Step 3: Cross multiply
    745.26x = 1,116.96 × 398.40
  4. Step 4: Simplify right side
    745.26x = 444,996.86
  5. Step 5: Solve for x
    x = 444,996.86/745.26
  6. Step 6: Final answer
    x = 597.10

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1.5x scale

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.