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Finding the Fourth Proportional to 656.88, 906.86 and 479.67

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Solution

The fourth proportional to 656.88, 906.86 and 479.67 is: 662.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.88 : 906.86 = 479.67 : x
  2. Step 2: Convert to fraction form
    656.88/906.86 = 479.67/x
  3. Step 3: Cross multiply
    656.88x = 906.86 × 479.67
  4. Step 4: Simplify right side
    656.88x = 434,991.33
  5. Step 5: Solve for x
    x = 434,991.33/656.88
  6. Step 6: Final answer
    x = 662.21

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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.