Home / 13,689.36-18,891.23-7,721.08

Finding the Fourth Proportional to 13,689.36, 18,891.23 and 7,721.08

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Solution

The fourth proportional to 13,689.36, 18,891.23 and 7,721.08 is: 10,655.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.36 : 18,891.23 = 7,721.08 : x
  2. Step 2: Convert to fraction form
    13,689.36/18,891.23 = 7,721.08/x
  3. Step 3: Cross multiply
    13,689.36x = 18,891.23 × 7,721.08
  4. Step 4: Simplify right side
    13,689.36x = 145,860,612.29
  5. Step 5: Solve for x
    x = 145,860,612.29/13,689.36
  6. Step 6: Final answer
    x = 10,655.04

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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.