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Finding the Fourth Proportional to 30.06, 45 and 21.06

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Solution

The fourth proportional to 30.06, 45 and 21.06 is: 31.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.06 : 45 = 21.06 : x
  2. Step 2: Convert to fraction form
    30.06/45 = 21.06/x
  3. Step 3: Cross multiply
    30.06x = 45 × 21.06
  4. Step 4: Simplify right side
    30.06x = 947.70
  5. Step 5: Solve for x
    x = 947.70/30.06
  6. Step 6: Final answer
    x = 31.53

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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.