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Finding the Fourth Proportional to 102.30, 153.36 and 74.94

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Solution

The fourth proportional to 102.30, 153.36 and 74.94 is: 112.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.30 : 153.36 = 74.94 : x
  2. Step 2: Convert to fraction form
    102.30/153.36 = 74.94/x
  3. Step 3: Cross multiply
    102.30x = 153.36 × 74.94
  4. Step 4: Simplify right side
    102.30x = 11,492.80
  5. Step 5: Solve for x
    x = 11,492.80/102.30
  6. Step 6: Final answer
    x = 112.34

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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.