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Finding the Fourth Proportional to 914.08, 1,370.80 and 427.36

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Solution

The fourth proportional to 914.08, 1,370.80 and 427.36 is: 640.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.08 : 1,370.80 = 427.36 : x
  2. Step 2: Convert to fraction form
    914.08/1,370.80 = 427.36/x
  3. Step 3: Cross multiply
    914.08x = 1,370.80 × 427.36
  4. Step 4: Simplify right side
    914.08x = 585,825.09
  5. Step 5: Solve for x
    x = 585,825.09/914.08
  6. Step 6: Final answer
    x = 640.89

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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.