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Finding the Fourth Proportional to 431.40, 647.20 and 157.49

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Solution

The fourth proportional to 431.40, 647.20 and 157.49 is: 236.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.40 : 647.20 = 157.49 : x
  2. Step 2: Convert to fraction form
    431.40/647.20 = 157.49/x
  3. Step 3: Cross multiply
    431.40x = 647.20 × 157.49
  4. Step 4: Simplify right side
    431.40x = 101,928.75
  5. Step 5: Solve for x
    x = 101,928.75/431.40
  6. Step 6: Final answer
    x = 236.27

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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.