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Finding the Fourth Proportional to 664.29, 916.77 and 384.60

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Solution

The fourth proportional to 664.29, 916.77 and 384.60 is: 530.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.29 : 916.77 = 384.60 : x
  2. Step 2: Convert to fraction form
    664.29/916.77 = 384.60/x
  3. Step 3: Cross multiply
    664.29x = 916.77 × 384.60
  4. Step 4: Simplify right side
    664.29x = 352,589.74
  5. Step 5: Solve for x
    x = 352,589.74/664.29
  6. Step 6: Final answer
    x = 530.78

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.