Home / 13,689.25-18,889.54-7,720.57

Finding the Fourth Proportional to 13,689.25, 18,889.54 and 7,720.57

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Solution

The fourth proportional to 13,689.25, 18,889.54 and 7,720.57 is: 10,653.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.25 : 18,889.54 = 7,720.57 : x
  2. Step 2: Convert to fraction form
    13,689.25/18,889.54 = 7,720.57/x
  3. Step 3: Cross multiply
    13,689.25x = 18,889.54 × 7,720.57
  4. Step 4: Simplify right side
    13,689.25x = 145,838,015.84
  5. Step 5: Solve for x
    x = 145,838,015.84/13,689.25
  6. Step 6: Final answer
    x = 10,653.47

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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.