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Finding the Fourth Proportional to 629.16, 871.98 and 619.80

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Solution

The fourth proportional to 629.16, 871.98 and 619.80 is: 859.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.16 : 871.98 = 619.80 : x
  2. Step 2: Convert to fraction form
    629.16/871.98 = 619.80/x
  3. Step 3: Cross multiply
    629.16x = 871.98 × 619.80
  4. Step 4: Simplify right side
    629.16x = 540,453.20
  5. Step 5: Solve for x
    x = 540,453.20/629.16
  6. Step 6: Final answer
    x = 859.01

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.