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Finding the Fourth Proportional to 914.88, 1,372.54 and 427.70

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Solution

The fourth proportional to 914.88, 1,372.54 and 427.70 is: 641.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.88 : 1,372.54 = 427.70 : x
  2. Step 2: Convert to fraction form
    914.88/1,372.54 = 427.70/x
  3. Step 3: Cross multiply
    914.88x = 1,372.54 × 427.70
  4. Step 4: Simplify right side
    914.88x = 587,035.36
  5. Step 5: Solve for x
    x = 587,035.36/914.88
  6. Step 6: Final answer
    x = 641.65

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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.