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Finding the Fourth Proportional to 637.07, 879.09 and 388.45

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Solution

The fourth proportional to 637.07, 879.09 and 388.45 is: 536.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.07 : 879.09 = 388.45 : x
  2. Step 2: Convert to fraction form
    637.07/879.09 = 388.45/x
  3. Step 3: Cross multiply
    637.07x = 879.09 × 388.45
  4. Step 4: Simplify right side
    637.07x = 341,477.21
  5. Step 5: Solve for x
    x = 341,477.21/637.07
  6. Step 6: Final answer
    x = 536.02

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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.