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Finding the Fourth Proportional to 947.20, 1,421.20 and 514.26

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Solution

The fourth proportional to 947.20, 1,421.20 and 514.26 is: 771.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.20 : 1,421.20 = 514.26 : x
  2. Step 2: Convert to fraction form
    947.20/1,421.20 = 514.26/x
  3. Step 3: Cross multiply
    947.20x = 1,421.20 × 514.26
  4. Step 4: Simplify right side
    947.20x = 730,866.31
  5. Step 5: Solve for x
    x = 730,866.31/947.20
  6. Step 6: Final answer
    x = 771.61

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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.