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Finding the Fourth Proportional to 1,403.36, 1,936.40 and 805.84

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Solution

The fourth proportional to 1,403.36, 1,936.40 and 805.84 is: 1,111.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.36 : 1,936.40 = 805.84 : x
  2. Step 2: Convert to fraction form
    1,403.36/1,936.40 = 805.84/x
  3. Step 3: Cross multiply
    1,403.36x = 1,936.40 × 805.84
  4. Step 4: Simplify right side
    1,403.36x = 1,560,428.58
  5. Step 5: Solve for x
    x = 1,560,428.58/1,403.36
  6. Step 6: Final answer
    x = 1,111.92

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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.