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Finding the Fourth Proportional to 45.70, 68.48 and 19.99

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Solution

The fourth proportional to 45.70, 68.48 and 19.99 is: 29.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.70 : 68.48 = 19.99 : x
  2. Step 2: Convert to fraction form
    45.70/68.48 = 19.99/x
  3. Step 3: Cross multiply
    45.70x = 68.48 × 19.99
  4. Step 4: Simplify right side
    45.70x = 1,368.64
  5. Step 5: Solve for x
    x = 1,368.64/45.70
  6. Step 6: Final answer
    x = 29.95

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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.