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Finding the Fourth Proportional to 664.42, 916.96 and 402.60

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Solution

The fourth proportional to 664.42, 916.96 and 402.60 is: 555.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.42 : 916.96 = 402.60 : x
  2. Step 2: Convert to fraction form
    664.42/916.96 = 402.60/x
  3. Step 3: Cross multiply
    664.42x = 916.96 × 402.60
  4. Step 4: Simplify right side
    664.42x = 369,168.10
  5. Step 5: Solve for x
    x = 369,168.10/664.42
  6. Step 6: Final answer
    x = 555.62

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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.