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Finding the Fourth Proportional to 655.06, 903.78 and 389.38

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Solution

The fourth proportional to 655.06, 903.78 and 389.38 is: 537.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.06 : 903.78 = 389.38 : x
  2. Step 2: Convert to fraction form
    655.06/903.78 = 389.38/x
  3. Step 3: Cross multiply
    655.06x = 903.78 × 389.38
  4. Step 4: Simplify right side
    655.06x = 351,913.86
  5. Step 5: Solve for x
    x = 351,913.86/655.06
  6. Step 6: Final answer
    x = 537.22

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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.