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Finding the Fourth Proportional to 664.29, 916.68 and 384.51

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Solution

The fourth proportional to 664.29, 916.68 and 384.51 is: 530.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.29 : 916.68 = 384.51 : x
  2. Step 2: Convert to fraction form
    664.29/916.68 = 384.51/x
  3. Step 3: Cross multiply
    664.29x = 916.68 × 384.51
  4. Step 4: Simplify right side
    664.29x = 352,472.63
  5. Step 5: Solve for x
    x = 352,472.63/664.29
  6. Step 6: Final answer
    x = 530.60

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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.