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Finding the Fourth Proportional to 858.52, 1,287.04 and 311.10

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Solution

The fourth proportional to 858.52, 1,287.04 and 311.10 is: 466.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.52 : 1,287.04 = 311.10 : x
  2. Step 2: Convert to fraction form
    858.52/1,287.04 = 311.10/x
  3. Step 3: Cross multiply
    858.52x = 1,287.04 × 311.10
  4. Step 4: Simplify right side
    858.52x = 400,398.14
  5. Step 5: Solve for x
    x = 400,398.14/858.52
  6. Step 6: Final answer
    x = 466.38

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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.