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Finding the Fourth Proportional to 664.10, 916.45 and 402.11

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Solution

The fourth proportional to 664.10, 916.45 and 402.11 is: 554.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.10 : 916.45 = 402.11 : x
  2. Step 2: Convert to fraction form
    664.10/916.45 = 402.11/x
  3. Step 3: Cross multiply
    664.10x = 916.45 × 402.11
  4. Step 4: Simplify right side
    664.10x = 368,513.71
  5. Step 5: Solve for x
    x = 368,513.71/664.10
  6. Step 6: Final answer
    x = 554.91

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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.