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Finding the Fourth Proportional to 859.13, 1,288.79 and 644.07

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Solution

The fourth proportional to 859.13, 1,288.79 and 644.07 is: 966.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.13 : 1,288.79 = 644.07 : x
  2. Step 2: Convert to fraction form
    859.13/1,288.79 = 644.07/x
  3. Step 3: Cross multiply
    859.13x = 1,288.79 × 644.07
  4. Step 4: Simplify right side
    859.13x = 830,067.75
  5. Step 5: Solve for x
    x = 830,067.75/859.13
  6. Step 6: Final answer
    x = 966.18

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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.