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Finding the Fourth Proportional to 629.64, 861.20 and 619.56

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Solution

The fourth proportional to 629.64, 861.20 and 619.56 is: 847.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.64 : 861.20 = 619.56 : x
  2. Step 2: Convert to fraction form
    629.64/861.20 = 619.56/x
  3. Step 3: Cross multiply
    629.64x = 861.20 × 619.56
  4. Step 4: Simplify right side
    629.64x = 533,565.07
  5. Step 5: Solve for x
    x = 533,565.07/629.64
  6. Step 6: Final answer
    x = 847.41

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.