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Finding the Fourth Proportional to 20,993.81, 28,970.34 and 12,040.88

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Solution

The fourth proportional to 20,993.81, 28,970.34 and 12,040.88 is: 16,615.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.81 : 28,970.34 = 12,040.88 : x
  2. Step 2: Convert to fraction form
    20,993.81/28,970.34 = 12,040.88/x
  3. Step 3: Cross multiply
    20,993.81x = 28,970.34 × 12,040.88
  4. Step 4: Simplify right side
    20,993.81x = 348,828,387.50
  5. Step 5: Solve for x
    x = 348,828,387.50/20,993.81
  6. Step 6: Final answer
    x = 16,615.77

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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.