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Finding the Fourth Proportional to 1,111.44, 1,533.91 and 639.36

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Solution

The fourth proportional to 1,111.44, 1,533.91 and 639.36 is: 882.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.44 : 1,533.91 = 639.36 : x
  2. Step 2: Convert to fraction form
    1,111.44/1,533.91 = 639.36/x
  3. Step 3: Cross multiply
    1,111.44x = 1,533.91 × 639.36
  4. Step 4: Simplify right side
    1,111.44x = 980,721.50
  5. Step 5: Solve for x
    x = 980,721.50/1,111.44
  6. Step 6: Final answer
    x = 882.39

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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.