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Finding the Fourth Proportional to 1,406.18, 1,940.19 and 816.36

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Solution

The fourth proportional to 1,406.18, 1,940.19 and 816.36 is: 1,126.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.18 : 1,940.19 = 816.36 : x
  2. Step 2: Convert to fraction form
    1,406.18/1,940.19 = 816.36/x
  3. Step 3: Cross multiply
    1,406.18x = 1,940.19 × 816.36
  4. Step 4: Simplify right side
    1,406.18x = 1,583,893.51
  5. Step 5: Solve for x
    x = 1,583,893.51/1,406.18
  6. Step 6: Final answer
    x = 1,126.38

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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.