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Finding the Fourth Proportional to 47.58, 71.40 and 18.69

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Solution

The fourth proportional to 47.58, 71.40 and 18.69 is: 28.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.58 : 71.40 = 18.69 : x
  2. Step 2: Convert to fraction form
    47.58/71.40 = 18.69/x
  3. Step 3: Cross multiply
    47.58x = 71.40 × 18.69
  4. Step 4: Simplify right side
    47.58x = 1,334.38
  5. Step 5: Solve for x
    x = 1,334.38/47.58
  6. Step 6: Final answer
    x = 28.05

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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.