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Finding the Fourth Proportional to 856.30, 1,283.91 and 445.56

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Solution

The fourth proportional to 856.30, 1,283.91 and 445.56 is: 668.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.30 : 1,283.91 = 445.56 : x
  2. Step 2: Convert to fraction form
    856.30/1,283.91 = 445.56/x
  3. Step 3: Cross multiply
    856.30x = 1,283.91 × 445.56
  4. Step 4: Simplify right side
    856.30x = 572,058.94
  5. Step 5: Solve for x
    x = 572,058.94/856.30
  6. Step 6: Final answer
    x = 668.06

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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.