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Finding the Fourth Proportional to 13,280.70, 19,921.05 and 8,615.10

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Solution

The fourth proportional to 13,280.70, 19,921.05 and 8,615.10 is: 12,922.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,280.70 : 19,921.05 = 8,615.10 : x
  2. Step 2: Convert to fraction form
    13,280.70/19,921.05 = 8,615.10/x
  3. Step 3: Cross multiply
    13,280.70x = 19,921.05 × 8,615.10
  4. Step 4: Simplify right side
    13,280.70x = 171,621,837.86
  5. Step 5: Solve for x
    x = 171,621,837.86/13,280.70
  6. Step 6: Final answer
    x = 12,922.65

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Similar ratio
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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.