Home / 13,688.05-18,890.15-7,719.59

Finding the Fourth Proportional to 13,688.05, 18,890.15 and 7,719.59

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Solution

The fourth proportional to 13,688.05, 18,890.15 and 7,719.59 is: 10,653.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.05 : 18,890.15 = 7,719.59 : x
  2. Step 2: Convert to fraction form
    13,688.05/18,890.15 = 7,719.59/x
  3. Step 3: Cross multiply
    13,688.05x = 18,890.15 × 7,719.59
  4. Step 4: Simplify right side
    13,688.05x = 145,824,174.44
  5. Step 5: Solve for x
    x = 145,824,174.44/13,688.05
  6. Step 6: Final answer
    x = 10,653.40

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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.