Home / 13,089.80-18,064.15-7,121.57

Finding the Fourth Proportional to 13,089.80, 18,064.15 and 7,121.57

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Solution

The fourth proportional to 13,089.80, 18,064.15 and 7,121.57 is: 9,827.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,089.80 : 18,064.15 = 7,121.57 : x
  2. Step 2: Convert to fraction form
    13,089.80/18,064.15 = 7,121.57/x
  3. Step 3: Cross multiply
    13,089.80x = 18,064.15 × 7,121.57
  4. Step 4: Simplify right side
    13,089.80x = 128,645,000.59
  5. Step 5: Solve for x
    x = 128,645,000.59/13,089.80
  6. Step 6: Final answer
    x = 9,827.88

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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.