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Finding the Fourth Proportional to 20,900.50, 28,856.20 and 12,951.16

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Solution

The fourth proportional to 20,900.50, 28,856.20 and 12,951.16 is: 17,880.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,900.50 : 28,856.20 = 12,951.16 : x
  2. Step 2: Convert to fraction form
    20,900.50/28,856.20 = 12,951.16/x
  3. Step 3: Cross multiply
    20,900.50x = 28,856.20 × 12,951.16
  4. Step 4: Simplify right side
    20,900.50x = 373,721,263.19
  5. Step 5: Solve for x
    x = 373,721,263.19/20,900.50
  6. Step 6: Final answer
    x = 17,880.97

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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.