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Finding the Fourth Proportional to 664.27, 916.45 and 402.19

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Solution

The fourth proportional to 664.27, 916.45 and 402.19 is: 554.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.27 : 916.45 = 402.19 : x
  2. Step 2: Convert to fraction form
    664.27/916.45 = 402.19/x
  3. Step 3: Cross multiply
    664.27x = 916.45 × 402.19
  4. Step 4: Simplify right side
    664.27x = 368,587.03
  5. Step 5: Solve for x
    x = 368,587.03/664.27
  6. Step 6: Final answer
    x = 554.88

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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.