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Finding the Fourth Proportional to 766.06, 1,054.44 and 640.34

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Solution

The fourth proportional to 766.06, 1,054.44 and 640.34 is: 881.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.06 : 1,054.44 = 640.34 : x
  2. Step 2: Convert to fraction form
    766.06/1,054.44 = 640.34/x
  3. Step 3: Cross multiply
    766.06x = 1,054.44 × 640.34
  4. Step 4: Simplify right side
    766.06x = 675,200.11
  5. Step 5: Solve for x
    x = 675,200.11/766.06
  6. Step 6: Final answer
    x = 881.39

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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.