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Finding the Fourth Proportional to 856.18, 1,285.18 and 423.64

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Solution

The fourth proportional to 856.18, 1,285.18 and 423.64 is: 635.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.18 : 1,285.18 = 423.64 : x
  2. Step 2: Convert to fraction form
    856.18/1,285.18 = 423.64/x
  3. Step 3: Cross multiply
    856.18x = 1,285.18 × 423.64
  4. Step 4: Simplify right side
    856.18x = 544,453.66
  5. Step 5: Solve for x
    x = 544,453.66/856.18
  6. Step 6: Final answer
    x = 635.91

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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.