Home / 9,990.48-13,779.08-6,405.78

Finding the Fourth Proportional to 9,990.48, 13,779.08 and 6,405.78

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Solution

The fourth proportional to 9,990.48, 13,779.08 and 6,405.78 is: 8,834.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990.48 : 13,779.08 = 6,405.78 : x
  2. Step 2: Convert to fraction form
    9,990.48/13,779.08 = 6,405.78/x
  3. Step 3: Cross multiply
    9,990.48x = 13,779.08 × 6,405.78
  4. Step 4: Simplify right side
    9,990.48x = 88,265,723.05
  5. Step 5: Solve for x
    x = 88,265,723.05/9,990.48
  6. Step 6: Final answer
    x = 8,834.98

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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.