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Finding the Fourth Proportional to 328.48, 491.95 and 259.54

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Solution

The fourth proportional to 328.48, 491.95 and 259.54 is: 388.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.48 : 491.95 = 259.54 : x
  2. Step 2: Convert to fraction form
    328.48/491.95 = 259.54/x
  3. Step 3: Cross multiply
    328.48x = 491.95 × 259.54
  4. Step 4: Simplify right side
    328.48x = 127,678.82
  5. Step 5: Solve for x
    x = 127,678.82/328.48
  6. Step 6: Final answer
    x = 388.70

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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.