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Finding the Fourth Proportional to 1,305.86, 1,802.12 and 808.38

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Solution

The fourth proportional to 1,305.86, 1,802.12 and 808.38 is: 1,115.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.86 : 1,802.12 = 808.38 : x
  2. Step 2: Convert to fraction form
    1,305.86/1,802.12 = 808.38/x
  3. Step 3: Cross multiply
    1,305.86x = 1,802.12 × 808.38
  4. Step 4: Simplify right side
    1,305.86x = 1,456,793.72
  5. Step 5: Solve for x
    x = 1,456,793.72/1,305.86
  6. Step 6: Final answer
    x = 1,115.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.