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Finding the Fourth Proportional to 745.89, 1,117.89 and 421.44

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Solution

The fourth proportional to 745.89, 1,117.89 and 421.44 is: 631.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.89 : 1,117.89 = 421.44 : x
  2. Step 2: Convert to fraction form
    745.89/1,117.89 = 421.44/x
  3. Step 3: Cross multiply
    745.89x = 1,117.89 × 421.44
  4. Step 4: Simplify right side
    745.89x = 471,123.56
  5. Step 5: Solve for x
    x = 471,123.56/745.89
  6. Step 6: Final answer
    x = 631.63

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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.