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Finding the Fourth Proportional to 213,679.13, 320,628.05 and 87,412.69

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Solution

The fourth proportional to 213,679.13, 320,628.05 and 87,412.69 is: 131,163.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,679.13 : 320,628.05 = 87,412.69 : x
  2. Step 2: Convert to fraction form
    213,679.13/320,628.05 = 87,412.69/x
  3. Step 3: Cross multiply
    213,679.13x = 320,628.05 × 87,412.69
  4. Step 4: Simplify right side
    213,679.13x = 28,026,959,101.32
  5. Step 5: Solve for x
    x = 28,026,959,101.32/213,679.13
  6. Step 6: Final answer
    x = 131,163.76

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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.