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Finding the Fourth Proportional to 20,390.79, 30,560.40 and 11,630.64

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Solution

The fourth proportional to 20,390.79, 30,560.40 and 11,630.64 is: 17,431.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.79 : 30,560.40 = 11,630.64 : x
  2. Step 2: Convert to fraction form
    20,390.79/30,560.40 = 11,630.64/x
  3. Step 3: Cross multiply
    20,390.79x = 30,560.40 × 11,630.64
  4. Step 4: Simplify right side
    20,390.79x = 355,437,010.66
  5. Step 5: Solve for x
    x = 355,437,010.66/20,390.79
  6. Step 6: Final answer
    x = 17,431.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.