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Finding the Fourth Proportional to 328.35, 491.47 and 287.35

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Solution

The fourth proportional to 328.35, 491.47 and 287.35 is: 430.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.35 : 491.47 = 287.35 : x
  2. Step 2: Convert to fraction form
    328.35/491.47 = 287.35/x
  3. Step 3: Cross multiply
    328.35x = 491.47 × 287.35
  4. Step 4: Simplify right side
    328.35x = 141,221.96
  5. Step 5: Solve for x
    x = 141,221.96/328.35
  6. Step 6: Final answer
    x = 430.09

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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.