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Finding the Fourth Proportional to 8,215.40, 12,332.70 and 8,157.80

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Solution

The fourth proportional to 8,215.40, 12,332.70 and 8,157.80 is: 12,246.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,215.40 : 12,332.70 = 8,157.80 : x
  2. Step 2: Convert to fraction form
    8,215.40/12,332.70 = 8,157.80/x
  3. Step 3: Cross multiply
    8,215.40x = 12,332.70 × 8,157.80
  4. Step 4: Simplify right side
    8,215.40x = 100,607,700.06
  5. Step 5: Solve for x
    x = 100,607,700.06/8,215.40
  6. Step 6: Final answer
    x = 12,246.23

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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.