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Finding the Fourth Proportional to 289.60, 434.28 and 238.72

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Solution

The fourth proportional to 289.60, 434.28 and 238.72 is: 357.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.60 : 434.28 = 238.72 : x
  2. Step 2: Convert to fraction form
    289.60/434.28 = 238.72/x
  3. Step 3: Cross multiply
    289.60x = 434.28 × 238.72
  4. Step 4: Simplify right side
    289.60x = 103,671.32
  5. Step 5: Solve for x
    x = 103,671.32/289.60
  6. Step 6: Final answer
    x = 357.98

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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.