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Finding the Fourth Proportional to 212.88, 320 and 176.48

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Solution

The fourth proportional to 212.88, 320 and 176.48 is: 265.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.88 : 320 = 176.48 : x
  2. Step 2: Convert to fraction form
    212.88/320 = 176.48/x
  3. Step 3: Cross multiply
    212.88x = 320 × 176.48
  4. Step 4: Simplify right side
    212.88x = 56,473.60
  5. Step 5: Solve for x
    x = 56,473.60/212.88
  6. Step 6: Final answer
    x = 265.28

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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.