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Finding the Fourth Proportional to 74.28, 102.40 and 53.56

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Solution

The fourth proportional to 74.28, 102.40 and 53.56 is: 73.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.28 : 102.40 = 53.56 : x
  2. Step 2: Convert to fraction form
    74.28/102.40 = 53.56/x
  3. Step 3: Cross multiply
    74.28x = 102.40 × 53.56
  4. Step 4: Simplify right side
    74.28x = 5,484.54
  5. Step 5: Solve for x
    x = 5,484.54/74.28
  6. Step 6: Final answer
    x = 73.84

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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.