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Finding the Fourth Proportional to 15,204.78, 20,984.71 and 8,490.85

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Solution

The fourth proportional to 15,204.78, 20,984.71 and 8,490.85 is: 11,718.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,204.78 : 20,984.71 = 8,490.85 : x
  2. Step 2: Convert to fraction form
    15,204.78/20,984.71 = 8,490.85/x
  3. Step 3: Cross multiply
    15,204.78x = 20,984.71 × 8,490.85
  4. Step 4: Simplify right side
    15,204.78x = 178,178,024.90
  5. Step 5: Solve for x
    x = 178,178,024.90/15,204.78
  6. Step 6: Final answer
    x = 11,718.55

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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.