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Finding the Fourth Proportional to 945.28, 1,409.44 and 928

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Solution

The fourth proportional to 945.28, 1,409.44 and 928 is: 1,383.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.28 : 1,409.44 = 928 : x
  2. Step 2: Convert to fraction form
    945.28/1,409.44 = 928/x
  3. Step 3: Cross multiply
    945.28x = 1,409.44 × 928
  4. Step 4: Simplify right side
    945.28x = 1,307,960.32
  5. Step 5: Solve for x
    x = 1,307,960.32/945.28
  6. Step 6: Final answer
    x = 1,383.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.