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Finding the Fourth Proportional to 213.36, 320.04 and 85.16

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Solution

The fourth proportional to 213.36, 320.04 and 85.16 is: 127.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.36 : 320.04 = 85.16 : x
  2. Step 2: Convert to fraction form
    213.36/320.04 = 85.16/x
  3. Step 3: Cross multiply
    213.36x = 320.04 × 85.16
  4. Step 4: Simplify right side
    213.36x = 27,254.61
  5. Step 5: Solve for x
    x = 27,254.61/213.36
  6. Step 6: Final answer
    x = 127.74

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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.