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Finding the Fourth Proportional to 953.89, 1,431.24 and 406.19

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Solution

The fourth proportional to 953.89, 1,431.24 and 406.19 is: 609.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.89 : 1,431.24 = 406.19 : x
  2. Step 2: Convert to fraction form
    953.89/1,431.24 = 406.19/x
  3. Step 3: Cross multiply
    953.89x = 1,431.24 × 406.19
  4. Step 4: Simplify right side
    953.89x = 581,355.38
  5. Step 5: Solve for x
    x = 581,355.38/953.89
  6. Step 6: Final answer
    x = 609.46

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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.