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Finding the Fourth Proportional to 962.78, 1,328.81 and 918.96

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Solution

The fourth proportional to 962.78, 1,328.81 and 918.96 is: 1,268.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    962.78 : 1,328.81 = 918.96 : x
  2. Step 2: Convert to fraction form
    962.78/1,328.81 = 918.96/x
  3. Step 3: Cross multiply
    962.78x = 1,328.81 × 918.96
  4. Step 4: Simplify right side
    962.78x = 1,221,125.54
  5. Step 5: Solve for x
    x = 1,221,125.54/962.78
  6. Step 6: Final answer
    x = 1,268.33

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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.