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Finding the Fourth Proportional to 328.58, 492.91 and 85.13

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Solution

The fourth proportional to 328.58, 492.91 and 85.13 is: 127.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.58 : 492.91 = 85.13 : x
  2. Step 2: Convert to fraction form
    328.58/492.91 = 85.13/x
  3. Step 3: Cross multiply
    328.58x = 492.91 × 85.13
  4. Step 4: Simplify right side
    328.58x = 41,959.45
  5. Step 5: Solve for x
    x = 41,959.45/328.58
  6. Step 6: Final answer
    x = 127.70

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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.