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Finding the Fourth Proportional to 328.96, 493.90 and 283.40

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Solution

The fourth proportional to 328.96, 493.90 and 283.40 is: 425.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.96 : 493.90 = 283.40 : x
  2. Step 2: Convert to fraction form
    328.96/493.90 = 283.40/x
  3. Step 3: Cross multiply
    328.96x = 493.90 × 283.40
  4. Step 4: Simplify right side
    328.96x = 139,969.93
  5. Step 5: Solve for x
    x = 139,969.93/328.96
  6. Step 6: Final answer
    x = 425.49

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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.