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Finding the Fourth Proportional to 20,480.96, 28,263.48 and 11,528.48

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Solution

The fourth proportional to 20,480.96, 28,263.48 and 11,528.48 is: 15,909.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,480.96 : 28,263.48 = 11,528.48 : x
  2. Step 2: Convert to fraction form
    20,480.96/28,263.48 = 11,528.48/x
  3. Step 3: Cross multiply
    20,480.96x = 28,263.48 × 11,528.48
  4. Step 4: Simplify right side
    20,480.96x = 325,834,963.91
  5. Step 5: Solve for x
    x = 325,834,963.91/20,480.96
  6. Step 6: Final answer
    x = 15,909.16

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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.