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Finding the Fourth Proportional to 1,111.07, 1,533.08 and 638.79

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Solution

The fourth proportional to 1,111.07, 1,533.08 and 638.79 is: 881.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.07 : 1,533.08 = 638.79 : x
  2. Step 2: Convert to fraction form
    1,111.07/1,533.08 = 638.79/x
  3. Step 3: Cross multiply
    1,111.07x = 1,533.08 × 638.79
  4. Step 4: Simplify right side
    1,111.07x = 979,320.64
  5. Step 5: Solve for x
    x = 979,320.64/1,111.07
  6. Step 6: Final answer
    x = 881.42

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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.