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Finding the Fourth Proportional to 885.89, 1,329.21 and 423.68

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Solution

The fourth proportional to 885.89, 1,329.21 and 423.68 is: 635.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.89 : 1,329.21 = 423.68 : x
  2. Step 2: Convert to fraction form
    885.89/1,329.21 = 423.68/x
  3. Step 3: Cross multiply
    885.89x = 1,329.21 × 423.68
  4. Step 4: Simplify right side
    885.89x = 563,153.05
  5. Step 5: Solve for x
    x = 563,153.05/885.89
  6. Step 6: Final answer
    x = 635.70

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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.