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Finding the Fourth Proportional to 856.10, 1,283.55 and 393.24

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Solution

The fourth proportional to 856.10, 1,283.55 and 393.24 is: 589.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.10 : 1,283.55 = 393.24 : x
  2. Step 2: Convert to fraction form
    856.10/1,283.55 = 393.24/x
  3. Step 3: Cross multiply
    856.10x = 1,283.55 × 393.24
  4. Step 4: Simplify right side
    856.10x = 504,743.20
  5. Step 5: Solve for x
    x = 504,743.20/856.10
  6. Step 6: Final answer
    x = 589.59

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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.