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Finding the Fourth Proportional to 389.21, 583.58 and 259.07

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Solution

The fourth proportional to 389.21, 583.58 and 259.07 is: 388.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.21 : 583.58 = 259.07 : x
  2. Step 2: Convert to fraction form
    389.21/583.58 = 259.07/x
  3. Step 3: Cross multiply
    389.21x = 583.58 × 259.07
  4. Step 4: Simplify right side
    389.21x = 151,185.80
  5. Step 5: Solve for x
    x = 151,185.80/389.21
  6. Step 6: Final answer
    x = 388.45

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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.