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Finding the Fourth Proportional to 8,420.79, 12,631.68 and 3,490.80

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Solution

The fourth proportional to 8,420.79, 12,631.68 and 3,490.80 is: 5,236.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,420.79 : 12,631.68 = 3,490.80 : x
  2. Step 2: Convert to fraction form
    8,420.79/12,631.68 = 3,490.80/x
  3. Step 3: Cross multiply
    8,420.79x = 12,631.68 × 3,490.80
  4. Step 4: Simplify right side
    8,420.79x = 44,094,668.54
  5. Step 5: Solve for x
    x = 44,094,668.54/8,420.79
  6. Step 6: Final answer
    x = 5,236.41

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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.