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Finding the Fourth Proportional to 28,796.88, 39,739.76 and 16,221.63

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Solution

The fourth proportional to 28,796.88, 39,739.76 and 16,221.63 is: 22,385.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,796.88 : 39,739.76 = 16,221.63 : x
  2. Step 2: Convert to fraction form
    28,796.88/39,739.76 = 16,221.63/x
  3. Step 3: Cross multiply
    28,796.88x = 39,739.76 × 16,221.63
  4. Step 4: Simplify right side
    28,796.88x = 644,643,683.01
  5. Step 5: Solve for x
    x = 644,643,683.01/28,796.88
  6. Step 6: Final answer
    x = 22,385.89

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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.