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Finding the Fourth Proportional to 1,212.91, 1,820.27 and 472.64

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Solution

The fourth proportional to 1,212.91, 1,820.27 and 472.64 is: 709.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.91 : 1,820.27 = 472.64 : x
  2. Step 2: Convert to fraction form
    1,212.91/1,820.27 = 472.64/x
  3. Step 3: Cross multiply
    1,212.91x = 1,820.27 × 472.64
  4. Step 4: Simplify right side
    1,212.91x = 860,332.41
  5. Step 5: Solve for x
    x = 860,332.41/1,212.91
  6. Step 6: Final answer
    x = 709.31

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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.