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Finding the Fourth Proportional to 28,798.90, 39,728.90 and 16,854.84

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Solution

The fourth proportional to 28,798.90, 39,728.90 and 16,854.84 is: 23,251.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,798.90 : 39,728.90 = 16,854.84 : x
  2. Step 2: Convert to fraction form
    28,798.90/39,728.90 = 16,854.84/x
  3. Step 3: Cross multiply
    28,798.90x = 39,728.90 × 16,854.84
  4. Step 4: Simplify right side
    28,798.90x = 669,624,252.88
  5. Step 5: Solve for x
    x = 669,624,252.88/28,798.90
  6. Step 6: Final answer
    x = 23,251.73

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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.