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Finding the Fourth Proportional to 953.87, 1,431.23 and 406.40

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Solution

The fourth proportional to 953.87, 1,431.23 and 406.40 is: 609.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.87 : 1,431.23 = 406.40 : x
  2. Step 2: Convert to fraction form
    953.87/1,431.23 = 406.40/x
  3. Step 3: Cross multiply
    953.87x = 1,431.23 × 406.40
  4. Step 4: Simplify right side
    953.87x = 581,642.68
  5. Step 5: Solve for x
    x = 581,642.68/953.87
  6. Step 6: Final answer
    x = 609.77

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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.