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Finding the Fourth Proportional to 330.72, 493.80 and 294.40

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Solution

The fourth proportional to 330.72, 493.80 and 294.40 is: 439.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.72 : 493.80 = 294.40 : x
  2. Step 2: Convert to fraction form
    330.72/493.80 = 294.40/x
  3. Step 3: Cross multiply
    330.72x = 493.80 × 294.40
  4. Step 4: Simplify right side
    330.72x = 145,374.72
  5. Step 5: Solve for x
    x = 145,374.72/330.72
  6. Step 6: Final answer
    x = 439.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.