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Finding the Fourth Proportional to 47.40, 65.36 and 27.98

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Solution

The fourth proportional to 47.40, 65.36 and 27.98 is: 38.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.40 : 65.36 = 27.98 : x
  2. Step 2: Convert to fraction form
    47.40/65.36 = 27.98/x
  3. Step 3: Cross multiply
    47.40x = 65.36 × 27.98
  4. Step 4: Simplify right side
    47.40x = 1,828.77
  5. Step 5: Solve for x
    x = 1,828.77/47.40
  6. Step 6: Final answer
    x = 38.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.