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Finding the Fourth Proportional to 328.98, 492.80 and 155.40

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Solution

The fourth proportional to 328.98, 492.80 and 155.40 is: 232.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.98 : 492.80 = 155.40 : x
  2. Step 2: Convert to fraction form
    328.98/492.80 = 155.40/x
  3. Step 3: Cross multiply
    328.98x = 492.80 × 155.40
  4. Step 4: Simplify right side
    328.98x = 76,580.34
  5. Step 5: Solve for x
    x = 76,580.34/328.98
  6. Step 6: Final answer
    x = 232.78

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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.