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Finding the Fourth Proportional to 15,004.80, 20,706.08 and 8,720.64

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Solution

The fourth proportional to 15,004.80, 20,706.08 and 8,720.64 is: 12,034.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,004.80 : 20,706.08 = 8,720.64 : x
  2. Step 2: Convert to fraction form
    15,004.80/20,706.08 = 8,720.64/x
  3. Step 3: Cross multiply
    15,004.80x = 20,706.08 × 8,720.64
  4. Step 4: Simplify right side
    15,004.80x = 180,570,269.49
  5. Step 5: Solve for x
    x = 180,570,269.49/15,004.80
  6. Step 6: Final answer
    x = 12,034.17

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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.