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Finding the Fourth Proportional to 945.28, 1,419 and 561.34

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Solution

The fourth proportional to 945.28, 1,419 and 561.34 is: 842.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.28 : 1,419 = 561.34 : x
  2. Step 2: Convert to fraction form
    945.28/1,419 = 561.34/x
  3. Step 3: Cross multiply
    945.28x = 1,419 × 561.34
  4. Step 4: Simplify right side
    945.28x = 796,541.46
  5. Step 5: Solve for x
    x = 796,541.46/945.28
  6. Step 6: Final answer
    x = 842.65

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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.