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Finding the Fourth Proportional to 656.98, 906.46 and 391.49

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Solution

The fourth proportional to 656.98, 906.46 and 391.49 is: 540.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.98 : 906.46 = 391.49 : x
  2. Step 2: Convert to fraction form
    656.98/906.46 = 391.49/x
  3. Step 3: Cross multiply
    656.98x = 906.46 × 391.49
  4. Step 4: Simplify right side
    656.98x = 354,870.03
  5. Step 5: Solve for x
    x = 354,870.03/656.98
  6. Step 6: Final answer
    x = 540.15

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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.