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Finding the Fourth Proportional to 30.12, 45.16 and 15.68

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Solution

The fourth proportional to 30.12, 45.16 and 15.68 is: 23.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.12 : 45.16 = 15.68 : x
  2. Step 2: Convert to fraction form
    30.12/45.16 = 15.68/x
  3. Step 3: Cross multiply
    30.12x = 45.16 × 15.68
  4. Step 4: Simplify right side
    30.12x = 708.11
  5. Step 5: Solve for x
    x = 708.11/30.12
  6. Step 6: Final answer
    x = 23.51

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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.