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Finding the Fourth Proportional to 289.90, 432.38 and 279.57

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Solution

The fourth proportional to 289.90, 432.38 and 279.57 is: 416.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.90 : 432.38 = 279.57 : x
  2. Step 2: Convert to fraction form
    289.90/432.38 = 279.57/x
  3. Step 3: Cross multiply
    289.90x = 432.38 × 279.57
  4. Step 4: Simplify right side
    289.90x = 120,880.48
  5. Step 5: Solve for x
    x = 120,880.48/289.90
  6. Step 6: Final answer
    x = 416.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.