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Finding the Fourth Proportional to 856.75, 1,286.05 and 424.82

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Solution

The fourth proportional to 856.75, 1,286.05 and 424.82 is: 637.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.75 : 1,286.05 = 424.82 : x
  2. Step 2: Convert to fraction form
    856.75/1,286.05 = 424.82/x
  3. Step 3: Cross multiply
    856.75x = 1,286.05 × 424.82
  4. Step 4: Simplify right side
    856.75x = 546,339.76
  5. Step 5: Solve for x
    x = 546,339.76/856.75
  6. Step 6: Final answer
    x = 637.69

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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.