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Finding the Fourth Proportional to 259.69, 358.40 and 172.55

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Solution

The fourth proportional to 259.69, 358.40 and 172.55 is: 238.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.69 : 358.40 = 172.55 : x
  2. Step 2: Convert to fraction form
    259.69/358.40 = 172.55/x
  3. Step 3: Cross multiply
    259.69x = 358.40 × 172.55
  4. Step 4: Simplify right side
    259.69x = 61,841.92
  5. Step 5: Solve for x
    x = 61,841.92/259.69
  6. Step 6: Final answer
    x = 238.14

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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.