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Finding the Fourth Proportional to 7,878.20, 10,869.90 and 4,893.80

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Solution

The fourth proportional to 7,878.20, 10,869.90 and 4,893.80 is: 6,752.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,878.20 : 10,869.90 = 4,893.80 : x
  2. Step 2: Convert to fraction form
    7,878.20/10,869.90 = 4,893.80/x
  3. Step 3: Cross multiply
    7,878.20x = 10,869.90 × 4,893.80
  4. Step 4: Simplify right side
    7,878.20x = 53,195,116.62
  5. Step 5: Solve for x
    x = 53,195,116.62/7,878.20
  6. Step 6: Final answer
    x = 6,752.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.