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Finding the Fourth Proportional to 328.86, 453.65 and 305.40

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Solution

The fourth proportional to 328.86, 453.65 and 305.40 is: 421.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.86 : 453.65 = 305.40 : x
  2. Step 2: Convert to fraction form
    328.86/453.65 = 305.40/x
  3. Step 3: Cross multiply
    328.86x = 453.65 × 305.40
  4. Step 4: Simplify right side
    328.86x = 138,544.71
  5. Step 5: Solve for x
    x = 138,544.71/328.86
  6. Step 6: Final answer
    x = 421.29

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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.