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Finding the Fourth Proportional to 46.68, 70.05 and 21

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Solution

The fourth proportional to 46.68, 70.05 and 21 is: 31.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.68 : 70.05 = 21 : x
  2. Step 2: Convert to fraction form
    46.68/70.05 = 21/x
  3. Step 3: Cross multiply
    46.68x = 70.05 × 21
  4. Step 4: Simplify right side
    46.68x = 1,471.05
  5. Step 5: Solve for x
    x = 1,471.05/46.68
  6. Step 6: Final answer
    x = 31.51

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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.