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Finding the Fourth Proportional to 28,703.52, 39,610.62 and 16,128

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Solution

The fourth proportional to 28,703.52, 39,610.62 and 16,128 is: 22,256.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,703.52 : 39,610.62 = 16,128 : x
  2. Step 2: Convert to fraction form
    28,703.52/39,610.62 = 16,128/x
  3. Step 3: Cross multiply
    28,703.52x = 39,610.62 × 16,128
  4. Step 4: Simplify right side
    28,703.52x = 638,840,079.36
  5. Step 5: Solve for x
    x = 638,840,079.36/28,703.52
  6. Step 6: Final answer
    x = 22,256.51

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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.