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Finding the Fourth Proportional to 603.07, 903.99 and 386.80

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Solution

The fourth proportional to 603.07, 903.99 and 386.80 is: 579.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.07 : 903.99 = 386.80 : x
  2. Step 2: Convert to fraction form
    603.07/903.99 = 386.80/x
  3. Step 3: Cross multiply
    603.07x = 903.99 × 386.80
  4. Step 4: Simplify right side
    603.07x = 349,663.33
  5. Step 5: Solve for x
    x = 349,663.33/603.07
  6. Step 6: Final answer
    x = 579.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.