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Finding the Fourth Proportional to 28,434, 39,238.92 and 15,858.76

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Solution

The fourth proportional to 28,434, 39,238.92 and 15,858.76 is: 21,885.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,434 : 39,238.92 = 15,858.76 : x
  2. Step 2: Convert to fraction form
    28,434/39,238.92 = 15,858.76/x
  3. Step 3: Cross multiply
    28,434x = 39,238.92 × 15,858.76
  4. Step 4: Simplify right side
    28,434x = 622,280,614.94
  5. Step 5: Solve for x
    x = 622,280,614.94/28,434
  6. Step 6: Final answer
    x = 21,885.09

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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.