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Finding the Fourth Proportional to 891.36, 1,335.96 and 783.36

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Solution

The fourth proportional to 891.36, 1,335.96 and 783.36 is: 1,174.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.36 : 1,335.96 = 783.36 : x
  2. Step 2: Convert to fraction form
    891.36/1,335.96 = 783.36/x
  3. Step 3: Cross multiply
    891.36x = 1,335.96 × 783.36
  4. Step 4: Simplify right side
    891.36x = 1,046,537.63
  5. Step 5: Solve for x
    x = 1,046,537.63/891.36
  6. Step 6: Final answer
    x = 1,174.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.