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Finding the Fourth Proportional to 745.50, 1,118.25 and 289.50

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Solution

The fourth proportional to 745.50, 1,118.25 and 289.50 is: 434.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.50 : 1,118.25 = 289.50 : x
  2. Step 2: Convert to fraction form
    745.50/1,118.25 = 289.50/x
  3. Step 3: Cross multiply
    745.50x = 1,118.25 × 289.50
  4. Step 4: Simplify right side
    745.50x = 323,733.38
  5. Step 5: Solve for x
    x = 323,733.38/745.50
  6. Step 6: Final answer
    x = 434.25

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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.