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Finding the Fourth Proportional to 947.92, 1,421.42 and 354.54

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Solution

The fourth proportional to 947.92, 1,421.42 and 354.54 is: 531.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.92 : 1,421.42 = 354.54 : x
  2. Step 2: Convert to fraction form
    947.92/1,421.42 = 354.54/x
  3. Step 3: Cross multiply
    947.92x = 1,421.42 × 354.54
  4. Step 4: Simplify right side
    947.92x = 503,950.25
  5. Step 5: Solve for x
    x = 503,950.25/947.92
  6. Step 6: Final answer
    x = 531.64

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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.