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Finding the Fourth Proportional to 918.26, 1,376.16 and 765.16

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Solution

The fourth proportional to 918.26, 1,376.16 and 765.16 is: 1,146.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.26 : 1,376.16 = 765.16 : x
  2. Step 2: Convert to fraction form
    918.26/1,376.16 = 765.16/x
  3. Step 3: Cross multiply
    918.26x = 1,376.16 × 765.16
  4. Step 4: Simplify right side
    918.26x = 1,052,982.59
  5. Step 5: Solve for x
    x = 1,052,982.59/918.26
  6. Step 6: Final answer
    x = 1,146.72

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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.