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Finding the Fourth Proportional to 947.28, 1,419.76 and 427.14

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Solution

The fourth proportional to 947.28, 1,419.76 and 427.14 is: 640.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.28 : 1,419.76 = 427.14 : x
  2. Step 2: Convert to fraction form
    947.28/1,419.76 = 427.14/x
  3. Step 3: Cross multiply
    947.28x = 1,419.76 × 427.14
  4. Step 4: Simplify right side
    947.28x = 606,436.82
  5. Step 5: Solve for x
    x = 606,436.82/947.28
  6. Step 6: Final answer
    x = 640.19

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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.