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Finding the Fourth Proportional to 7,877.60, 11,806.80 and 3,490.40

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Solution

The fourth proportional to 7,877.60, 11,806.80 and 3,490.40 is: 5,231.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,877.60 : 11,806.80 = 3,490.40 : x
  2. Step 2: Convert to fraction form
    7,877.60/11,806.80 = 3,490.40/x
  3. Step 3: Cross multiply
    7,877.60x = 11,806.80 × 3,490.40
  4. Step 4: Simplify right side
    7,877.60x = 41,210,454.72
  5. Step 5: Solve for x
    x = 41,210,454.72/7,877.60
  6. Step 6: Final answer
    x = 5,231.35

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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.