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Finding the Fourth Proportional to 958.43, 1,439.30 and 570.87

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Solution

The fourth proportional to 958.43, 1,439.30 and 570.87 is: 857.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.43 : 1,439.30 = 570.87 : x
  2. Step 2: Convert to fraction form
    958.43/1,439.30 = 570.87/x
  3. Step 3: Cross multiply
    958.43x = 1,439.30 × 570.87
  4. Step 4: Simplify right side
    958.43x = 821,650.34
  5. Step 5: Solve for x
    x = 821,650.34/958.43
  6. Step 6: Final answer
    x = 857.29

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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.