Home / 13,685.12-18,885.09-7,716.74

Finding the Fourth Proportional to 13,685.12, 18,885.09 and 7,716.74

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Solution

The fourth proportional to 13,685.12, 18,885.09 and 7,716.74 is: 10,648.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,685.12 : 18,885.09 = 7,716.74 : x
  2. Step 2: Convert to fraction form
    13,685.12/18,885.09 = 7,716.74/x
  3. Step 3: Cross multiply
    13,685.12x = 18,885.09 × 7,716.74
  4. Step 4: Simplify right side
    13,685.12x = 145,731,329.41
  5. Step 5: Solve for x
    x = 145,731,329.41/13,685.12
  6. Step 6: Final answer
    x = 10,648.89

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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.