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Finding the Fourth Proportional to 745.12, 1,117.50 and 306.25

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Solution

The fourth proportional to 745.12, 1,117.50 and 306.25 is: 459.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.12 : 1,117.50 = 306.25 : x
  2. Step 2: Convert to fraction form
    745.12/1,117.50 = 306.25/x
  3. Step 3: Cross multiply
    745.12x = 1,117.50 × 306.25
  4. Step 4: Simplify right side
    745.12x = 342,234.38
  5. Step 5: Solve for x
    x = 342,234.38/745.12
  6. Step 6: Final answer
    x = 459.30

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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.