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Finding the Fourth Proportional to 947.78, 1,421.28 and 331.36

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Solution

The fourth proportional to 947.78, 1,421.28 and 331.36 is: 496.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.78 : 1,421.28 = 331.36 : x
  2. Step 2: Convert to fraction form
    947.78/1,421.28 = 331.36/x
  3. Step 3: Cross multiply
    947.78x = 1,421.28 × 331.36
  4. Step 4: Simplify right side
    947.78x = 470,955.34
  5. Step 5: Solve for x
    x = 470,955.34/947.78
  6. Step 6: Final answer
    x = 496.90

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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.