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Finding the Fourth Proportional to 8,785.20, 13,177.80 and 7,978.80

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Solution

The fourth proportional to 8,785.20, 13,177.80 and 7,978.80 is: 11,968.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,785.20 : 13,177.80 = 7,978.80 : x
  2. Step 2: Convert to fraction form
    8,785.20/13,177.80 = 7,978.80/x
  3. Step 3: Cross multiply
    8,785.20x = 13,177.80 × 7,978.80
  4. Step 4: Simplify right side
    8,785.20x = 105,143,030.64
  5. Step 5: Solve for x
    x = 105,143,030.64/8,785.20
  6. Step 6: Final answer
    x = 11,968.20

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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.