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Finding the Fourth Proportional to 664.07, 916.34 and 398.45

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Solution

The fourth proportional to 664.07, 916.34 and 398.45 is: 549.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.07 : 916.34 = 398.45 : x
  2. Step 2: Convert to fraction form
    664.07/916.34 = 398.45/x
  3. Step 3: Cross multiply
    664.07x = 916.34 × 398.45
  4. Step 4: Simplify right side
    664.07x = 365,115.97
  5. Step 5: Solve for x
    x = 365,115.97/664.07
  6. Step 6: Final answer
    x = 549.82

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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.