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Finding the Fourth Proportional to 13,390.76, 20,078.78 and 10,635.08

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Solution

The fourth proportional to 13,390.76, 20,078.78 and 10,635.08 is: 15,946.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.76 : 20,078.78 = 10,635.08 : x
  2. Step 2: Convert to fraction form
    13,390.76/20,078.78 = 10,635.08/x
  3. Step 3: Cross multiply
    13,390.76x = 20,078.78 × 10,635.08
  4. Step 4: Simplify right side
    13,390.76x = 213,539,431.60
  5. Step 5: Solve for x
    x = 213,539,431.60/13,390.76
  6. Step 6: Final answer
    x = 15,946.77

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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.