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Finding the Fourth Proportional to 15,044.16, 20,760.64 and 8,420.16

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Solution

The fourth proportional to 15,044.16, 20,760.64 and 8,420.16 is: 11,619.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,044.16 : 20,760.64 = 8,420.16 : x
  2. Step 2: Convert to fraction form
    15,044.16/20,760.64 = 8,420.16/x
  3. Step 3: Cross multiply
    15,044.16x = 20,760.64 × 8,420.16
  4. Step 4: Simplify right side
    15,044.16x = 174,807,910.50
  5. Step 5: Solve for x
    x = 174,807,910.50/15,044.16
  6. Step 6: Final answer
    x = 11,619.65

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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.