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Finding the Fourth Proportional to 664.29, 916.65 and 384.48

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Solution

The fourth proportional to 664.29, 916.65 and 384.48 is: 530.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.29 : 916.65 = 384.48 : x
  2. Step 2: Convert to fraction form
    664.29/916.65 = 384.48/x
  3. Step 3: Cross multiply
    664.29x = 916.65 × 384.48
  4. Step 4: Simplify right side
    664.29x = 352,433.59
  5. Step 5: Solve for x
    x = 352,433.59/664.29
  6. Step 6: Final answer
    x = 530.54

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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.