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Finding the Fourth Proportional to 745.56, 1,118.40 and 380.22

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Solution

The fourth proportional to 745.56, 1,118.40 and 380.22 is: 570.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.56 : 1,118.40 = 380.22 : x
  2. Step 2: Convert to fraction form
    745.56/1,118.40 = 380.22/x
  3. Step 3: Cross multiply
    745.56x = 1,118.40 × 380.22
  4. Step 4: Simplify right side
    745.56x = 425,238.05
  5. Step 5: Solve for x
    x = 425,238.05/745.56
  6. Step 6: Final answer
    x = 570.36

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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.