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Finding the Fourth Proportional to 328.60, 492.40 and 256.84

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Solution

The fourth proportional to 328.60, 492.40 and 256.84 is: 384.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.60 : 492.40 = 256.84 : x
  2. Step 2: Convert to fraction form
    328.60/492.40 = 256.84/x
  3. Step 3: Cross multiply
    328.60x = 492.40 × 256.84
  4. Step 4: Simplify right side
    328.60x = 126,468.02
  5. Step 5: Solve for x
    x = 126,468.02/328.60
  6. Step 6: Final answer
    x = 384.87

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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.