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Finding the Fourth Proportional to 20,980.58, 28,953.20 and 11,420.50

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Solution

The fourth proportional to 20,980.58, 28,953.20 and 11,420.50 is: 15,760.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,980.58 : 28,953.20 = 11,420.50 : x
  2. Step 2: Convert to fraction form
    20,980.58/28,953.20 = 11,420.50/x
  3. Step 3: Cross multiply
    20,980.58x = 28,953.20 × 11,420.50
  4. Step 4: Simplify right side
    20,980.58x = 330,660,020.60
  5. Step 5: Solve for x
    x = 330,660,020.60/20,980.58
  6. Step 6: Final answer
    x = 15,760.29

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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.