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Finding the Fourth Proportional to 259.74, 389.20 and 172.98

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Solution

The fourth proportional to 259.74, 389.20 and 172.98 is: 259.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.74 : 389.20 = 172.98 : x
  2. Step 2: Convert to fraction form
    259.74/389.20 = 172.98/x
  3. Step 3: Cross multiply
    259.74x = 389.20 × 172.98
  4. Step 4: Simplify right side
    259.74x = 67,323.82
  5. Step 5: Solve for x
    x = 67,323.82/259.74
  6. Step 6: Final answer
    x = 259.20

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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.