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Finding the Fourth Proportional to 389.45, 583.40 and 259.05

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Solution

The fourth proportional to 389.45, 583.40 and 259.05 is: 388.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.45 : 583.40 = 259.05 : x
  2. Step 2: Convert to fraction form
    389.45/583.40 = 259.05/x
  3. Step 3: Cross multiply
    389.45x = 583.40 × 259.05
  4. Step 4: Simplify right side
    389.45x = 151,128.47
  5. Step 5: Solve for x
    x = 151,128.47/389.45
  6. Step 6: Final answer
    x = 388.06

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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.