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Finding the Fourth Proportional to 1,228.14, 1,695.18 and 808.81

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Solution

The fourth proportional to 1,228.14, 1,695.18 and 808.81 is: 1,116.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.14 : 1,695.18 = 808.81 : x
  2. Step 2: Convert to fraction form
    1,228.14/1,695.18 = 808.81/x
  3. Step 3: Cross multiply
    1,228.14x = 1,695.18 × 808.81
  4. Step 4: Simplify right side
    1,228.14x = 1,371,078.54
  5. Step 5: Solve for x
    x = 1,371,078.54/1,228.14
  6. Step 6: Final answer
    x = 1,116.39

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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.