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Finding the Fourth Proportional to 328.77, 493.13 and 85.28

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Solution

The fourth proportional to 328.77, 493.13 and 85.28 is: 127.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.77 : 493.13 = 85.28 : x
  2. Step 2: Convert to fraction form
    328.77/493.13 = 85.28/x
  3. Step 3: Cross multiply
    328.77x = 493.13 × 85.28
  4. Step 4: Simplify right side
    328.77x = 42,051.23
  5. Step 5: Solve for x
    x = 42,051.23/328.77
  6. Step 6: Final answer
    x = 127.90

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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.