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Finding the Fourth Proportional to 947.67, 1,421.94 and 427.40

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Solution

The fourth proportional to 947.67, 1,421.94 and 427.40 is: 641.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.67 : 1,421.94 = 427.40 : x
  2. Step 2: Convert to fraction form
    947.67/1,421.94 = 427.40/x
  3. Step 3: Cross multiply
    947.67x = 1,421.94 × 427.40
  4. Step 4: Simplify right side
    947.67x = 607,730.05
  5. Step 5: Solve for x
    x = 607,730.05/947.67
  6. Step 6: Final answer
    x = 641.29

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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.