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Finding the Fourth Proportional to 664.41, 916.91 and 384.63

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Solution

The fourth proportional to 664.41, 916.91 and 384.63 is: 530.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.41 : 916.91 = 384.63 : x
  2. Step 2: Convert to fraction form
    664.41/916.91 = 384.63/x
  3. Step 3: Cross multiply
    664.41x = 916.91 × 384.63
  4. Step 4: Simplify right side
    664.41x = 352,669.17
  5. Step 5: Solve for x
    x = 352,669.17/664.41
  6. Step 6: Final answer
    x = 530.80

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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.