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Finding the Fourth Proportional to 20,346.76, 28,081.02 and 12,390.13

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Solution

The fourth proportional to 20,346.76, 28,081.02 and 12,390.13 is: 17,099.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,346.76 : 28,081.02 = 12,390.13 : x
  2. Step 2: Convert to fraction form
    20,346.76/28,081.02 = 12,390.13/x
  3. Step 3: Cross multiply
    20,346.76x = 28,081.02 × 12,390.13
  4. Step 4: Simplify right side
    20,346.76x = 347,927,488.33
  5. Step 5: Solve for x
    x = 347,927,488.33/20,346.76
  6. Step 6: Final answer
    x = 17,099.90

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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.