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Finding the Fourth Proportional to 8,455.40, 12,683.10 and 2,215.40

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Solution

The fourth proportional to 8,455.40, 12,683.10 and 2,215.40 is: 3,323.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,455.40 : 12,683.10 = 2,215.40 : x
  2. Step 2: Convert to fraction form
    8,455.40/12,683.10 = 2,215.40/x
  3. Step 3: Cross multiply
    8,455.40x = 12,683.10 × 2,215.40
  4. Step 4: Simplify right side
    8,455.40x = 28,098,139.74
  5. Step 5: Solve for x
    x = 28,098,139.74/8,455.40
  6. Step 6: Final answer
    x = 3,323.10

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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.