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Finding the Fourth Proportional to 910.08, 1,261.61 and 860.82

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Solution

The fourth proportional to 910.08, 1,261.61 and 860.82 is: 1,193.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.08 : 1,261.61 = 860.82 : x
  2. Step 2: Convert to fraction form
    910.08/1,261.61 = 860.82/x
  3. Step 3: Cross multiply
    910.08x = 1,261.61 × 860.82
  4. Step 4: Simplify right side
    910.08x = 1,086,014.82
  5. Step 5: Solve for x
    x = 1,086,014.82/910.08
  6. Step 6: Final answer
    x = 1,193.32

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.