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Finding the Fourth Proportional to 328.49, 492.71 and 191.45

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Solution

The fourth proportional to 328.49, 492.71 and 191.45 is: 287.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.49 : 492.71 = 191.45 : x
  2. Step 2: Convert to fraction form
    328.49/492.71 = 191.45/x
  3. Step 3: Cross multiply
    328.49x = 492.71 × 191.45
  4. Step 4: Simplify right side
    328.49x = 94,329.33
  5. Step 5: Solve for x
    x = 94,329.33/328.49
  6. Step 6: Final answer
    x = 287.16

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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.