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Finding the Fourth Proportional to 664.37, 916.79 and 384.56

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Solution

The fourth proportional to 664.37, 916.79 and 384.56 is: 530.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.37 : 916.79 = 384.56 : x
  2. Step 2: Convert to fraction form
    664.37/916.79 = 384.56/x
  3. Step 3: Cross multiply
    664.37x = 916.79 × 384.56
  4. Step 4: Simplify right side
    664.37x = 352,554.26
  5. Step 5: Solve for x
    x = 352,554.26/664.37
  6. Step 6: Final answer
    x = 530.66

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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.