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Finding the Fourth Proportional to 1,081.02, 1,491.74 and 639.06

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Solution

The fourth proportional to 1,081.02, 1,491.74 and 639.06 is: 881.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.02 : 1,491.74 = 639.06 : x
  2. Step 2: Convert to fraction form
    1,081.02/1,491.74 = 639.06/x
  3. Step 3: Cross multiply
    1,081.02x = 1,491.74 × 639.06
  4. Step 4: Simplify right side
    1,081.02x = 953,311.36
  5. Step 5: Solve for x
    x = 953,311.36/1,081.02
  6. Step 6: Final answer
    x = 881.86

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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.