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Finding the Fourth Proportional to 38,679, 53,374.14 and 21,911.64

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Solution

The fourth proportional to 38,679, 53,374.14 and 21,911.64 is: 30,236.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,679 : 53,374.14 = 21,911.64 : x
  2. Step 2: Convert to fraction form
    38,679/53,374.14 = 21,911.64/x
  3. Step 3: Cross multiply
    38,679x = 53,374.14 × 21,911.64
  4. Step 4: Simplify right side
    38,679x = 1,169,514,940.99
  5. Step 5: Solve for x
    x = 1,169,514,940.99/38,679
  6. Step 6: Final answer
    x = 30,236.43

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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.