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Finding the Fourth Proportional to 389.12, 583.44 and 172.80

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Solution

The fourth proportional to 389.12, 583.44 and 172.80 is: 259.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.12 : 583.44 = 172.80 : x
  2. Step 2: Convert to fraction form
    389.12/583.44 = 172.80/x
  3. Step 3: Cross multiply
    389.12x = 583.44 × 172.80
  4. Step 4: Simplify right side
    389.12x = 100,818.43
  5. Step 5: Solve for x
    x = 100,818.43/389.12
  6. Step 6: Final answer
    x = 259.09

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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.