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Finding the Fourth Proportional to 664.72, 916.86 and 609.64

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Solution

The fourth proportional to 664.72, 916.86 and 609.64 is: 840.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.72 : 916.86 = 609.64 : x
  2. Step 2: Convert to fraction form
    664.72/916.86 = 609.64/x
  3. Step 3: Cross multiply
    664.72x = 916.86 × 609.64
  4. Step 4: Simplify right side
    664.72x = 558,954.53
  5. Step 5: Solve for x
    x = 558,954.53/664.72
  6. Step 6: Final answer
    x = 840.89

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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.