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Finding the Fourth Proportional to 745.86, 1,119.20 and 307.43

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Solution

The fourth proportional to 745.86, 1,119.20 and 307.43 is: 461.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.86 : 1,119.20 = 307.43 : x
  2. Step 2: Convert to fraction form
    745.86/1,119.20 = 307.43/x
  3. Step 3: Cross multiply
    745.86x = 1,119.20 × 307.43
  4. Step 4: Simplify right side
    745.86x = 344,080.47
  5. Step 5: Solve for x
    x = 344,080.47/745.86
  6. Step 6: Final answer
    x = 461.32

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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.