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Finding the Fourth Proportional to 46.99, 70.45 and 19.92

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Solution

The fourth proportional to 46.99, 70.45 and 19.92 is: 29.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.99 : 70.45 = 19.92 : x
  2. Step 2: Convert to fraction form
    46.99/70.45 = 19.92/x
  3. Step 3: Cross multiply
    46.99x = 70.45 × 19.92
  4. Step 4: Simplify right side
    46.99x = 1,403.36
  5. Step 5: Solve for x
    x = 1,403.36/46.99
  6. Step 6: Final answer
    x = 29.87

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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.