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Finding the Fourth Proportional to 664.28, 916.88 and 384.54

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Solution

The fourth proportional to 664.28, 916.88 and 384.54 is: 530.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.28 : 916.88 = 384.54 : x
  2. Step 2: Convert to fraction form
    664.28/916.88 = 384.54/x
  3. Step 3: Cross multiply
    664.28x = 916.88 × 384.54
  4. Step 4: Simplify right side
    664.28x = 352,575.11
  5. Step 5: Solve for x
    x = 352,575.11/664.28
  6. Step 6: Final answer
    x = 530.77

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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.