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Finding the Fourth Proportional to 212.30, 318.35 and 75.36

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Solution

The fourth proportional to 212.30, 318.35 and 75.36 is: 113.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.30 : 318.35 = 75.36 : x
  2. Step 2: Convert to fraction form
    212.30/318.35 = 75.36/x
  3. Step 3: Cross multiply
    212.30x = 318.35 × 75.36
  4. Step 4: Simplify right side
    212.30x = 23,990.86
  5. Step 5: Solve for x
    x = 23,990.86/212.30
  6. Step 6: Final answer
    x = 113.00

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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.