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Finding the Fourth Proportional to 45.08, 67.59 and 21

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Solution

The fourth proportional to 45.08, 67.59 and 21 is: 31.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.08 : 67.59 = 21 : x
  2. Step 2: Convert to fraction form
    45.08/67.59 = 21/x
  3. Step 3: Cross multiply
    45.08x = 67.59 × 21
  4. Step 4: Simplify right side
    45.08x = 1,419.39
  5. Step 5: Solve for x
    x = 1,419.39/45.08
  6. Step 6: Final answer
    x = 31.49

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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.