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Finding the Fourth Proportional to 1,295.80, 1,942.86 and 808.12

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Solution

The fourth proportional to 1,295.80, 1,942.86 and 808.12 is: 1,211.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,295.80 : 1,942.86 = 808.12 : x
  2. Step 2: Convert to fraction form
    1,295.80/1,942.86 = 808.12/x
  3. Step 3: Cross multiply
    1,295.80x = 1,942.86 × 808.12
  4. Step 4: Simplify right side
    1,295.80x = 1,570,064.02
  5. Step 5: Solve for x
    x = 1,570,064.02/1,295.80
  6. Step 6: Final answer
    x = 1,211.66

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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.