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Finding the Fourth Proportional to 431.45, 646.58 and 236.49

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Solution

The fourth proportional to 431.45, 646.58 and 236.49 is: 354.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.45 : 646.58 = 236.49 : x
  2. Step 2: Convert to fraction form
    431.45/646.58 = 236.49/x
  3. Step 3: Cross multiply
    431.45x = 646.58 × 236.49
  4. Step 4: Simplify right side
    431.45x = 152,908.52
  5. Step 5: Solve for x
    x = 152,908.52/431.45
  6. Step 6: Final answer
    x = 354.41

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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.