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Finding the Fourth Proportional to 656.15, 905.48 and 394.17

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Solution

The fourth proportional to 656.15, 905.48 and 394.17 is: 543.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.15 : 905.48 = 394.17 : x
  2. Step 2: Convert to fraction form
    656.15/905.48 = 394.17/x
  3. Step 3: Cross multiply
    656.15x = 905.48 × 394.17
  4. Step 4: Simplify right side
    656.15x = 356,913.05
  5. Step 5: Solve for x
    x = 356,913.05/656.15
  6. Step 6: Final answer
    x = 543.95

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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.