Home / 13,685.15-18,885.52-7,716.80

Finding the Fourth Proportional to 13,685.15, 18,885.52 and 7,716.80

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Solution

The fourth proportional to 13,685.15, 18,885.52 and 7,716.80 is: 10,649.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,685.15 : 18,885.52 = 7,716.80 : x
  2. Step 2: Convert to fraction form
    13,685.15/18,885.52 = 7,716.80/x
  3. Step 3: Cross multiply
    13,685.15x = 18,885.52 × 7,716.80
  4. Step 4: Simplify right side
    13,685.15x = 145,735,837.60
  5. Step 5: Solve for x
    x = 145,735,837.60/13,685.15
  6. Step 6: Final answer
    x = 10,649.19

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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.