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Finding the Fourth Proportional to 8,585.60, 12,878.40 and 4,200.80

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Solution

The fourth proportional to 8,585.60, 12,878.40 and 4,200.80 is: 6,301.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,585.60 : 12,878.40 = 4,200.80 : x
  2. Step 2: Convert to fraction form
    8,585.60/12,878.40 = 4,200.80/x
  3. Step 3: Cross multiply
    8,585.60x = 12,878.40 × 4,200.80
  4. Step 4: Simplify right side
    8,585.60x = 54,099,582.72
  5. Step 5: Solve for x
    x = 54,099,582.72/8,585.60
  6. Step 6: Final answer
    x = 6,301.20

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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.