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Finding the Fourth Proportional to 745.45, 1,118.75 and 380.55

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Solution

The fourth proportional to 745.45, 1,118.75 and 380.55 is: 571.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.45 : 1,118.75 = 380.55 : x
  2. Step 2: Convert to fraction form
    745.45/1,118.75 = 380.55/x
  3. Step 3: Cross multiply
    745.45x = 1,118.75 × 380.55
  4. Step 4: Simplify right side
    745.45x = 425,740.31
  5. Step 5: Solve for x
    x = 425,740.31/745.45
  6. Step 6: Final answer
    x = 571.12

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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.