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Finding the Fourth Proportional to 328.80, 493 and 155.40

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Solution

The fourth proportional to 328.80, 493 and 155.40 is: 233.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.80 : 493 = 155.40 : x
  2. Step 2: Convert to fraction form
    328.80/493 = 155.40/x
  3. Step 3: Cross multiply
    328.80x = 493 × 155.40
  4. Step 4: Simplify right side
    328.80x = 76,612.20
  5. Step 5: Solve for x
    x = 76,612.20/328.80
  6. Step 6: Final answer
    x = 233.01

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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.