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Finding the Fourth Proportional to 20,652.80, 28,501.02 and 11,221.40

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Solution

The fourth proportional to 20,652.80, 28,501.02 and 11,221.40 is: 15,485.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,652.80 : 28,501.02 = 11,221.40 : x
  2. Step 2: Convert to fraction form
    20,652.80/28,501.02 = 11,221.40/x
  3. Step 3: Cross multiply
    20,652.80x = 28,501.02 × 11,221.40
  4. Step 4: Simplify right side
    20,652.80x = 319,821,345.83
  5. Step 5: Solve for x
    x = 319,821,345.83/20,652.80
  6. Step 6: Final answer
    x = 15,485.62

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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.