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Finding the Fourth Proportional to 102.22, 153.47 and 90.68

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Solution

The fourth proportional to 102.22, 153.47 and 90.68 is: 136.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.22 : 153.47 = 90.68 : x
  2. Step 2: Convert to fraction form
    102.22/153.47 = 90.68/x
  3. Step 3: Cross multiply
    102.22x = 153.47 × 90.68
  4. Step 4: Simplify right side
    102.22x = 13,916.12
  5. Step 5: Solve for x
    x = 13,916.12/102.22
  6. Step 6: Final answer
    x = 136.14

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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.