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Finding the Fourth Proportional to 664.31, 916.76 and 384.55

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Solution

The fourth proportional to 664.31, 916.76 and 384.55 is: 530.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.31 : 916.76 = 384.55 : x
  2. Step 2: Convert to fraction form
    664.31/916.76 = 384.55/x
  3. Step 3: Cross multiply
    664.31x = 916.76 × 384.55
  4. Step 4: Simplify right side
    664.31x = 352,535.84
  5. Step 5: Solve for x
    x = 352,535.84/664.31
  6. Step 6: Final answer
    x = 530.68

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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.