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Finding the Fourth Proportional to 1,406.17, 1,940.59 and 808.85

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Solution

The fourth proportional to 1,406.17, 1,940.59 and 808.85 is: 1,116.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.17 : 1,940.59 = 808.85 : x
  2. Step 2: Convert to fraction form
    1,406.17/1,940.59 = 808.85/x
  3. Step 3: Cross multiply
    1,406.17x = 1,940.59 × 808.85
  4. Step 4: Simplify right side
    1,406.17x = 1,569,652.08
  5. Step 5: Solve for x
    x = 1,569,652.08/1,406.17
  6. Step 6: Final answer
    x = 1,116.26

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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.