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Finding the Fourth Proportional to 20,877.71, 28,812.74 and 12,924.54

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Solution

The fourth proportional to 20,877.71, 28,812.74 and 12,924.54 is: 17,836.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,877.71 : 28,812.74 = 12,924.54 : x
  2. Step 2: Convert to fraction form
    20,877.71/28,812.74 = 12,924.54/x
  3. Step 3: Cross multiply
    20,877.71x = 28,812.74 × 12,924.54
  4. Step 4: Simplify right side
    20,877.71x = 372,391,346.02
  5. Step 5: Solve for x
    x = 372,391,346.02/20,877.71
  6. Step 6: Final answer
    x = 17,836.80

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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.