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Finding the Fourth Proportional to 947.28, 1,418.76 and 873.84

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Solution

The fourth proportional to 947.28, 1,418.76 and 873.84 is: 1,308.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.28 : 1,418.76 = 873.84 : x
  2. Step 2: Convert to fraction form
    947.28/1,418.76 = 873.84/x
  3. Step 3: Cross multiply
    947.28x = 1,418.76 × 873.84
  4. Step 4: Simplify right side
    947.28x = 1,239,769.24
  5. Step 5: Solve for x
    x = 1,239,769.24/947.28
  6. Step 6: Final answer
    x = 1,308.77

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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.