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Finding the Fourth Proportional to 30.13, 41.57 and 21.51

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Solution

The fourth proportional to 30.13, 41.57 and 21.51 is: 29.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.13 : 41.57 = 21.51 : x
  2. Step 2: Convert to fraction form
    30.13/41.57 = 21.51/x
  3. Step 3: Cross multiply
    30.13x = 41.57 × 21.51
  4. Step 4: Simplify right side
    30.13x = 894.06
  5. Step 5: Solve for x
    x = 894.06/30.13
  6. Step 6: Final answer
    x = 29.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.