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Finding the Fourth Proportional to 19.61, 29.45 and 12.53

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Solution

The fourth proportional to 19.61, 29.45 and 12.53 is: 18.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.61 : 29.45 = 12.53 : x
  2. Step 2: Convert to fraction form
    19.61/29.45 = 12.53/x
  3. Step 3: Cross multiply
    19.61x = 29.45 × 12.53
  4. Step 4: Simplify right side
    19.61x = 368.95
  5. Step 5: Solve for x
    x = 368.95/19.61
  6. Step 6: Final answer
    x = 18.81

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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.