Home / 8,779.20-13,149.60-5,310.40

Finding the Fourth Proportional to 8,779.20, 13,149.60 and 5,310.40

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Solution

The fourth proportional to 8,779.20, 13,149.60 and 5,310.40 is: 7,953.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,779.20 : 13,149.60 = 5,310.40 : x
  2. Step 2: Convert to fraction form
    8,779.20/13,149.60 = 5,310.40/x
  3. Step 3: Cross multiply
    8,779.20x = 13,149.60 × 5,310.40
  4. Step 4: Simplify right side
    8,779.20x = 69,829,635.84
  5. Step 5: Solve for x
    x = 69,829,635.84/8,779.20
  6. Step 6: Final answer
    x = 7,953.99

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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.