Home / 7,087.20-9,779.90-3,899.85

Finding the Fourth Proportional to 7,087.20, 9,779.90 and 3,899.85

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Solution

The fourth proportional to 7,087.20, 9,779.90 and 3,899.85 is: 5,381.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,087.20 : 9,779.90 = 3,899.85 : x
  2. Step 2: Convert to fraction form
    7,087.20/9,779.90 = 3,899.85/x
  3. Step 3: Cross multiply
    7,087.20x = 9,779.90 × 3,899.85
  4. Step 4: Simplify right side
    7,087.20x = 38,140,143.02
  5. Step 5: Solve for x
    x = 38,140,143.02/7,087.20
  6. Step 6: Final answer
    x = 5,381.55

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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.