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Finding the Fourth Proportional to 45.07, 67.61 and 21.03

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Solution

The fourth proportional to 45.07, 67.61 and 21.03 is: 31.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.07 : 67.61 = 21.03 : x
  2. Step 2: Convert to fraction form
    45.07/67.61 = 21.03/x
  3. Step 3: Cross multiply
    45.07x = 67.61 × 21.03
  4. Step 4: Simplify right side
    45.07x = 1,421.64
  5. Step 5: Solve for x
    x = 1,421.64/45.07
  6. Step 6: Final answer
    x = 31.54

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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.