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Finding the Fourth Proportional to 858.96, 1,287.90 and 310.86

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Solution

The fourth proportional to 858.96, 1,287.90 and 310.86 is: 466.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.96 : 1,287.90 = 310.86 : x
  2. Step 2: Convert to fraction form
    858.96/1,287.90 = 310.86/x
  3. Step 3: Cross multiply
    858.96x = 1,287.90 × 310.86
  4. Step 4: Simplify right side
    858.96x = 400,356.59
  5. Step 5: Solve for x
    x = 400,356.59/858.96
  6. Step 6: Final answer
    x = 466.09

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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.