Home / 13,680.12-18,878.73-7,711.79

Finding the Fourth Proportional to 13,680.12, 18,878.73 and 7,711.79

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Solution

The fourth proportional to 13,680.12, 18,878.73 and 7,711.79 is: 10,642.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,680.12 : 18,878.73 = 7,711.79 : x
  2. Step 2: Convert to fraction form
    13,680.12/18,878.73 = 7,711.79/x
  3. Step 3: Cross multiply
    13,680.12x = 18,878.73 × 7,711.79
  4. Step 4: Simplify right side
    13,680.12x = 145,588,801.23
  5. Step 5: Solve for x
    x = 145,588,801.23/13,680.12
  6. Step 6: Final answer
    x = 10,642.36

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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.