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Finding the Fourth Proportional to 289.83, 434.74 and 135.72

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Solution

The fourth proportional to 289.83, 434.74 and 135.72 is: 203.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.83 : 434.74 = 135.72 : x
  2. Step 2: Convert to fraction form
    289.83/434.74 = 135.72/x
  3. Step 3: Cross multiply
    289.83x = 434.74 × 135.72
  4. Step 4: Simplify right side
    289.83x = 59,002.91
  5. Step 5: Solve for x
    x = 59,002.91/289.83
  6. Step 6: Final answer
    x = 203.58

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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.