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Finding the Fourth Proportional to 8,585.40, 12,878.70 and 3,390.60

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Solution

The fourth proportional to 8,585.40, 12,878.70 and 3,390.60 is: 5,086.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,585.40 : 12,878.70 = 3,390.60 : x
  2. Step 2: Convert to fraction form
    8,585.40/12,878.70 = 3,390.60/x
  3. Step 3: Cross multiply
    8,585.40x = 12,878.70 × 3,390.60
  4. Step 4: Simplify right side
    8,585.40x = 43,666,520.22
  5. Step 5: Solve for x
    x = 43,666,520.22/8,585.40
  6. Step 6: Final answer
    x = 5,086.14

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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.