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Finding the Fourth Proportional to 1,111.29, 1,533.10 and 639.08

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Solution

The fourth proportional to 1,111.29, 1,533.10 and 639.08 is: 881.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.29 : 1,533.10 = 639.08 : x
  2. Step 2: Convert to fraction form
    1,111.29/1,533.10 = 639.08/x
  3. Step 3: Cross multiply
    1,111.29x = 1,533.10 × 639.08
  4. Step 4: Simplify right side
    1,111.29x = 979,765.88
  5. Step 5: Solve for x
    x = 979,765.88/1,111.29
  6. Step 6: Final answer
    x = 881.65

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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.