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Finding the Fourth Proportional to 74.64, 103.02 and 45.12

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Solution

The fourth proportional to 74.64, 103.02 and 45.12 is: 62.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.64 : 103.02 = 45.12 : x
  2. Step 2: Convert to fraction form
    74.64/103.02 = 45.12/x
  3. Step 3: Cross multiply
    74.64x = 103.02 × 45.12
  4. Step 4: Simplify right side
    74.64x = 4,648.26
  5. Step 5: Solve for x
    x = 4,648.26/74.64
  6. Step 6: Final answer
    x = 62.28

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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.