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Finding the Fourth Proportional to 664, 916.48 and 388.16

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Solution

The fourth proportional to 664, 916.48 and 388.16 is: 535.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    664 : 916.48 = 388.16 : x
  2. Step 2: Convert to fraction form
    664/916.48 = 388.16/x
  3. Step 3: Cross multiply
    664x = 916.48 × 388.16
  4. Step 4: Simplify right side
    664x = 355,740.88
  5. Step 5: Solve for x
    x = 355,740.88/664
  6. Step 6: Final answer
    x = 535.75

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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.