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Finding the Fourth Proportional to 914.54, 1,261.63 and 665.75

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Solution

The fourth proportional to 914.54, 1,261.63 and 665.75 is: 918.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.54 : 1,261.63 = 665.75 : x
  2. Step 2: Convert to fraction form
    914.54/1,261.63 = 665.75/x
  3. Step 3: Cross multiply
    914.54x = 1,261.63 × 665.75
  4. Step 4: Simplify right side
    914.54x = 839,930.17
  5. Step 5: Solve for x
    x = 839,930.17/914.54
  6. Step 6: Final answer
    x = 918.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.