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Finding the Fourth Proportional to 947.69, 1,421.51 and 331.39

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Solution

The fourth proportional to 947.69, 1,421.51 and 331.39 is: 497.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.69 : 1,421.51 = 331.39 : x
  2. Step 2: Convert to fraction form
    947.69/1,421.51 = 331.39/x
  3. Step 3: Cross multiply
    947.69x = 1,421.51 × 331.39
  4. Step 4: Simplify right side
    947.69x = 471,074.20
  5. Step 5: Solve for x
    x = 471,074.20/947.69
  6. Step 6: Final answer
    x = 497.08

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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.