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Finding the Fourth Proportional to 20,655, 28,503.69 and 11,223.60

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Solution

The fourth proportional to 20,655, 28,503.69 and 11,223.60 is: 15,488.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,655 : 28,503.69 = 11,223.60 : x
  2. Step 2: Convert to fraction form
    20,655/28,503.69 = 11,223.60/x
  3. Step 3: Cross multiply
    20,655x = 28,503.69 × 11,223.60
  4. Step 4: Simplify right side
    20,655x = 319,914,015.08
  5. Step 5: Solve for x
    x = 319,914,015.08/20,655
  6. Step 6: Final answer
    x = 15,488.45

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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.