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Finding the Fourth Proportional to 873.78, 1,310.46 and 386.56

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Solution

The fourth proportional to 873.78, 1,310.46 and 386.56 is: 579.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.78 : 1,310.46 = 386.56 : x
  2. Step 2: Convert to fraction form
    873.78/1,310.46 = 386.56/x
  3. Step 3: Cross multiply
    873.78x = 1,310.46 × 386.56
  4. Step 4: Simplify right side
    873.78x = 506,571.42
  5. Step 5: Solve for x
    x = 506,571.42/873.78
  6. Step 6: Final answer
    x = 579.75

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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.