Home / 8,520.20-12,780.30-7,807.40

Finding the Fourth Proportional to 8,520.20, 12,780.30 and 7,807.40

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Solution

The fourth proportional to 8,520.20, 12,780.30 and 7,807.40 is: 11,711.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,520.20 : 12,780.30 = 7,807.40 : x
  2. Step 2: Convert to fraction form
    8,520.20/12,780.30 = 7,807.40/x
  3. Step 3: Cross multiply
    8,520.20x = 12,780.30 × 7,807.40
  4. Step 4: Simplify right side
    8,520.20x = 99,780,914.22
  5. Step 5: Solve for x
    x = 99,780,914.22/8,520.20
  6. Step 6: Final answer
    x = 11,711.10

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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.