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Finding the Fourth Proportional to 856.98, 1,283.22 and 423

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Solution

The fourth proportional to 856.98, 1,283.22 and 423 is: 633.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.98 : 1,283.22 = 423 : x
  2. Step 2: Convert to fraction form
    856.98/1,283.22 = 423/x
  3. Step 3: Cross multiply
    856.98x = 1,283.22 × 423
  4. Step 4: Simplify right side
    856.98x = 542,802.06
  5. Step 5: Solve for x
    x = 542,802.06/856.98
  6. Step 6: Final answer
    x = 633.39

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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.