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Finding the Fourth Proportional to 8,615.40, 12,906.90 and 8,032.20

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Solution

The fourth proportional to 8,615.40, 12,906.90 and 8,032.20 is: 12,033.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,615.40 : 12,906.90 = 8,032.20 : x
  2. Step 2: Convert to fraction form
    8,615.40/12,906.90 = 8,032.20/x
  3. Step 3: Cross multiply
    8,615.40x = 12,906.90 × 8,032.20
  4. Step 4: Simplify right side
    8,615.40x = 103,670,802.18
  5. Step 5: Solve for x
    x = 103,670,802.18/8,615.40
  6. Step 6: Final answer
    x = 12,033.20

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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.