Home / 11,405.72-15,740.88-6,690.80

Finding the Fourth Proportional to 11,405.72, 15,740.88 and 6,690.80

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Solution

The fourth proportional to 11,405.72, 15,740.88 and 6,690.80 is: 9,233.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,405.72 : 15,740.88 = 6,690.80 : x
  2. Step 2: Convert to fraction form
    11,405.72/15,740.88 = 6,690.80/x
  3. Step 3: Cross multiply
    11,405.72x = 15,740.88 × 6,690.80
  4. Step 4: Simplify right side
    11,405.72x = 105,319,079.90
  5. Step 5: Solve for x
    x = 105,319,079.90/11,405.72
  6. Step 6: Final answer
    x = 9,233.88

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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.