Home / 11,115.60-15,341.40-6,642.80

Finding the Fourth Proportional to 11,115.60, 15,341.40 and 6,642.80

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Solution

The fourth proportional to 11,115.60, 15,341.40 and 6,642.80 is: 9,168.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,115.60 : 15,341.40 = 6,642.80 : x
  2. Step 2: Convert to fraction form
    11,115.60/15,341.40 = 6,642.80/x
  3. Step 3: Cross multiply
    11,115.60x = 15,341.40 × 6,642.80
  4. Step 4: Simplify right side
    11,115.60x = 101,909,851.92
  5. Step 5: Solve for x
    x = 101,909,851.92/11,115.60
  6. Step 6: Final answer
    x = 9,168.18

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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.