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Finding the Fourth Proportional to 388.26, 581.60 and 289.63

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Solution

The fourth proportional to 388.26, 581.60 and 289.63 is: 433.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.26 : 581.60 = 289.63 : x
  2. Step 2: Convert to fraction form
    388.26/581.60 = 289.63/x
  3. Step 3: Cross multiply
    388.26x = 581.60 × 289.63
  4. Step 4: Simplify right side
    388.26x = 168,445.36
  5. Step 5: Solve for x
    x = 168,445.36/388.26
  6. Step 6: Final answer
    x = 433.85

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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.