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Finding the Fourth Proportional to 556.26, 766.90 and 486.60

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Solution

The fourth proportional to 556.26, 766.90 and 486.60 is: 670.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.26 : 766.90 = 486.60 : x
  2. Step 2: Convert to fraction form
    556.26/766.90 = 486.60/x
  3. Step 3: Cross multiply
    556.26x = 766.90 × 486.60
  4. Step 4: Simplify right side
    556.26x = 373,173.54
  5. Step 5: Solve for x
    x = 373,173.54/556.26
  6. Step 6: Final answer
    x = 670.86

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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.