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Finding the Fourth Proportional to 947.28, 1,420.92 and 369.84

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Solution

The fourth proportional to 947.28, 1,420.92 and 369.84 is: 554.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.28 : 1,420.92 = 369.84 : x
  2. Step 2: Convert to fraction form
    947.28/1,420.92 = 369.84/x
  3. Step 3: Cross multiply
    947.28x = 1,420.92 × 369.84
  4. Step 4: Simplify right side
    947.28x = 525,513.05
  5. Step 5: Solve for x
    x = 525,513.05/947.28
  6. Step 6: Final answer
    x = 554.76

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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.