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Finding the Fourth Proportional to 664.62, 916.95 and 388.62

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Solution

The fourth proportional to 664.62, 916.95 and 388.62 is: 536.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.62 : 916.95 = 388.62 : x
  2. Step 2: Convert to fraction form
    664.62/916.95 = 388.62/x
  3. Step 3: Cross multiply
    664.62x = 916.95 × 388.62
  4. Step 4: Simplify right side
    664.62x = 356,345.11
  5. Step 5: Solve for x
    x = 356,345.11/664.62
  6. Step 6: Final answer
    x = 536.16

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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.