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Finding the Fourth Proportional to 39,321, 54,262.38 and 21,415.56

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Solution

The fourth proportional to 39,321, 54,262.38 and 21,415.56 is: 29,553.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,321 : 54,262.38 = 21,415.56 : x
  2. Step 2: Convert to fraction form
    39,321/54,262.38 = 21,415.56/x
  3. Step 3: Cross multiply
    39,321x = 54,262.38 × 21,415.56
  4. Step 4: Simplify right side
    39,321x = 1,162,059,254.63
  5. Step 5: Solve for x
    x = 1,162,059,254.63/39,321
  6. Step 6: Final answer
    x = 29,553.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.