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Finding the Fourth Proportional to 58,072.64, 87,091.68 and 21,128

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Solution

The fourth proportional to 58,072.64, 87,091.68 and 21,128 is: 31,685.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,072.64 : 87,091.68 = 21,128 : x
  2. Step 2: Convert to fraction form
    58,072.64/87,091.68 = 21,128/x
  3. Step 3: Cross multiply
    58,072.64x = 87,091.68 × 21,128
  4. Step 4: Simplify right side
    58,072.64x = 1,840,073,015.04
  5. Step 5: Solve for x
    x = 1,840,073,015.04/58,072.64
  6. Step 6: Final answer
    x = 31,685.71

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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.