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Finding the Fourth Proportional to 328.80, 493.20 and 85.32

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Solution

The fourth proportional to 328.80, 493.20 and 85.32 is: 127.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.80 : 493.20 = 85.32 : x
  2. Step 2: Convert to fraction form
    328.80/493.20 = 85.32/x
  3. Step 3: Cross multiply
    328.80x = 493.20 × 85.32
  4. Step 4: Simplify right side
    328.80x = 42,079.82
  5. Step 5: Solve for x
    x = 42,079.82/328.80
  6. Step 6: Final answer
    x = 127.98

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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.