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Finding the Fourth Proportional to 289.53, 434.29 and 145.21

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Solution

The fourth proportional to 289.53, 434.29 and 145.21 is: 217.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.53 : 434.29 = 145.21 : x
  2. Step 2: Convert to fraction form
    289.53/434.29 = 145.21/x
  3. Step 3: Cross multiply
    289.53x = 434.29 × 145.21
  4. Step 4: Simplify right side
    289.53x = 63,062.89
  5. Step 5: Solve for x
    x = 63,062.89/289.53
  6. Step 6: Final answer
    x = 217.82

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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.