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Finding the Fourth Proportional to 435.38, 653.08 and 138.84

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Solution

The fourth proportional to 435.38, 653.08 and 138.84 is: 208.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.38 : 653.08 = 138.84 : x
  2. Step 2: Convert to fraction form
    435.38/653.08 = 138.84/x
  3. Step 3: Cross multiply
    435.38x = 653.08 × 138.84
  4. Step 4: Simplify right side
    435.38x = 90,673.63
  5. Step 5: Solve for x
    x = 90,673.63/435.38
  6. Step 6: Final answer
    x = 208.26

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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.