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Finding the Fourth Proportional to 664.06, 916.42 and 415.30

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Solution

The fourth proportional to 664.06, 916.42 and 415.30 is: 573.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.06 : 916.42 = 415.30 : x
  2. Step 2: Convert to fraction form
    664.06/916.42 = 415.30/x
  3. Step 3: Cross multiply
    664.06x = 916.42 × 415.30
  4. Step 4: Simplify right side
    664.06x = 380,583.61
  5. Step 5: Solve for x
    x = 380,583.61/664.06
  6. Step 6: Final answer
    x = 573.12

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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.