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Finding the Fourth Proportional to 858.24, 1,276.92 and 855.36

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Solution

The fourth proportional to 858.24, 1,276.92 and 855.36 is: 1,272.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.24 : 1,276.92 = 855.36 : x
  2. Step 2: Convert to fraction form
    858.24/1,276.92 = 855.36/x
  3. Step 3: Cross multiply
    858.24x = 1,276.92 × 855.36
  4. Step 4: Simplify right side
    858.24x = 1,092,226.29
  5. Step 5: Solve for x
    x = 1,092,226.29/858.24
  6. Step 6: Final answer
    x = 1,272.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.