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Finding the Fourth Proportional to 858.22, 1,287.67 and 511.74

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Solution

The fourth proportional to 858.22, 1,287.67 and 511.74 is: 767.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.22 : 1,287.67 = 511.74 : x
  2. Step 2: Convert to fraction form
    858.22/1,287.67 = 511.74/x
  3. Step 3: Cross multiply
    858.22x = 1,287.67 × 511.74
  4. Step 4: Simplify right side
    858.22x = 658,956.99
  5. Step 5: Solve for x
    x = 658,956.99/858.22
  6. Step 6: Final answer
    x = 767.82

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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.