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Finding the Fourth Proportional to 328.61, 491.49 and 312

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Solution

The fourth proportional to 328.61, 491.49 and 312 is: 466.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.61 : 491.49 = 312 : x
  2. Step 2: Convert to fraction form
    328.61/491.49 = 312/x
  3. Step 3: Cross multiply
    328.61x = 491.49 × 312
  4. Step 4: Simplify right side
    328.61x = 153,344.88
  5. Step 5: Solve for x
    x = 153,344.88/328.61
  6. Step 6: Final answer
    x = 466.65

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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.