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Finding the Fourth Proportional to 660.83, 912.04 and 398.99

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Solution

The fourth proportional to 660.83, 912.04 and 398.99 is: 550.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.83 : 912.04 = 398.99 : x
  2. Step 2: Convert to fraction form
    660.83/912.04 = 398.99/x
  3. Step 3: Cross multiply
    660.83x = 912.04 × 398.99
  4. Step 4: Simplify right side
    660.83x = 363,892.84
  5. Step 5: Solve for x
    x = 363,892.84/660.83
  6. Step 6: Final answer
    x = 550.66

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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.