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Finding the Fourth Proportional to 8,632.20, 12,938.70 and 4,739.40

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Solution

The fourth proportional to 8,632.20, 12,938.70 and 4,739.40 is: 7,103.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,632.20 : 12,938.70 = 4,739.40 : x
  2. Step 2: Convert to fraction form
    8,632.20/12,938.70 = 4,739.40/x
  3. Step 3: Cross multiply
    8,632.20x = 12,938.70 × 4,739.40
  4. Step 4: Simplify right side
    8,632.20x = 61,321,674.78
  5. Step 5: Solve for x
    x = 61,321,674.78/8,632.20
  6. Step 6: Final answer
    x = 7,103.83

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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.