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Finding the Fourth Proportional to 43.79, 65.66 and 19.40

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Solution

The fourth proportional to 43.79, 65.66 and 19.40 is: 29.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.79 : 65.66 = 19.40 : x
  2. Step 2: Convert to fraction form
    43.79/65.66 = 19.40/x
  3. Step 3: Cross multiply
    43.79x = 65.66 × 19.40
  4. Step 4: Simplify right side
    43.79x = 1,273.63
  5. Step 5: Solve for x
    x = 1,273.63/43.79
  6. Step 6: Final answer
    x = 29.08

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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.