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Finding the Fourth Proportional to 745.30, 1,118.67 and 380.35

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Solution

The fourth proportional to 745.30, 1,118.67 and 380.35 is: 570.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.30 : 1,118.67 = 380.35 : x
  2. Step 2: Convert to fraction form
    745.30/1,118.67 = 380.35/x
  3. Step 3: Cross multiply
    745.30x = 1,118.67 × 380.35
  4. Step 4: Simplify right side
    745.30x = 425,486.13
  5. Step 5: Solve for x
    x = 425,486.13/745.30
  6. Step 6: Final answer
    x = 570.89

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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.