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Finding the Fourth Proportional to 857.62, 1,276.05 and 854.62

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Solution

The fourth proportional to 857.62, 1,276.05 and 854.62 is: 1,271.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.62 : 1,276.05 = 854.62 : x
  2. Step 2: Convert to fraction form
    857.62/1,276.05 = 854.62/x
  3. Step 3: Cross multiply
    857.62x = 1,276.05 × 854.62
  4. Step 4: Simplify right side
    857.62x = 1,090,537.85
  5. Step 5: Solve for x
    x = 1,090,537.85/857.62
  6. Step 6: Final answer
    x = 1,271.59

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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.