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Finding the Fourth Proportional to 28,812.71, 39,760.50 and 16,875.80

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Solution

The fourth proportional to 28,812.71, 39,760.50 and 16,875.80 is: 23,287.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,812.71 : 39,760.50 = 16,875.80 : x
  2. Step 2: Convert to fraction form
    28,812.71/39,760.50 = 16,875.80/x
  3. Step 3: Cross multiply
    28,812.71x = 39,760.50 × 16,875.80
  4. Step 4: Simplify right side
    28,812.71x = 670,990,245.90
  5. Step 5: Solve for x
    x = 670,990,245.90/28,812.71
  6. Step 6: Final answer
    x = 23,287.99

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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.