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Finding the Fourth Proportional to 873.45, 1,310.26 and 288.21

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Solution

The fourth proportional to 873.45, 1,310.26 and 288.21 is: 432.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.45 : 1,310.26 = 288.21 : x
  2. Step 2: Convert to fraction form
    873.45/1,310.26 = 288.21/x
  3. Step 3: Cross multiply
    873.45x = 1,310.26 × 288.21
  4. Step 4: Simplify right side
    873.45x = 377,630.03
  5. Step 5: Solve for x
    x = 377,630.03/873.45
  6. Step 6: Final answer
    x = 432.34

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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.