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Finding the Fourth Proportional to 1,387.78, 1,913.97 and 1,092.58

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Solution

The fourth proportional to 1,387.78, 1,913.97 and 1,092.58 is: 1,506.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.78 : 1,913.97 = 1,092.58 : x
  2. Step 2: Convert to fraction form
    1,387.78/1,913.97 = 1,092.58/x
  3. Step 3: Cross multiply
    1,387.78x = 1,913.97 × 1,092.58
  4. Step 4: Simplify right side
    1,387.78x = 2,091,165.34
  5. Step 5: Solve for x
    x = 2,091,165.34/1,387.78
  6. Step 6: Final answer
    x = 1,506.84

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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.