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Finding the Fourth Proportional to 656.99, 906.84 and 391.62

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Solution

The fourth proportional to 656.99, 906.84 and 391.62 is: 540.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.99 : 906.84 = 391.62 : x
  2. Step 2: Convert to fraction form
    656.99/906.84 = 391.62/x
  3. Step 3: Cross multiply
    656.99x = 906.84 × 391.62
  4. Step 4: Simplify right side
    656.99x = 355,134.98
  5. Step 5: Solve for x
    x = 355,134.98/656.99
  6. Step 6: Final answer
    x = 540.54

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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.