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Finding the Fourth Proportional to 659.94, 911.22 and 398.30

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Solution

The fourth proportional to 659.94, 911.22 and 398.30 is: 549.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.94 : 911.22 = 398.30 : x
  2. Step 2: Convert to fraction form
    659.94/911.22 = 398.30/x
  3. Step 3: Cross multiply
    659.94x = 911.22 × 398.30
  4. Step 4: Simplify right side
    659.94x = 362,938.93
  5. Step 5: Solve for x
    x = 362,938.93/659.94
  6. Step 6: Final answer
    x = 549.96

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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.