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Finding the Fourth Proportional to 664.05, 915.57 and 623.96

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Solution

The fourth proportional to 664.05, 915.57 and 623.96 is: 860.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.05 : 915.57 = 623.96 : x
  2. Step 2: Convert to fraction form
    664.05/915.57 = 623.96/x
  3. Step 3: Cross multiply
    664.05x = 915.57 × 623.96
  4. Step 4: Simplify right side
    664.05x = 571,274.48
  5. Step 5: Solve for x
    x = 571,274.48/664.05
  6. Step 6: Final answer
    x = 860.29

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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.