Home / 9,139.80-12,612.66-5,160.80

Finding the Fourth Proportional to 9,139.80, 12,612.66 and 5,160.80

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Solution

The fourth proportional to 9,139.80, 12,612.66 and 5,160.80 is: 7,121.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,139.80 : 12,612.66 = 5,160.80 : x
  2. Step 2: Convert to fraction form
    9,139.80/12,612.66 = 5,160.80/x
  3. Step 3: Cross multiply
    9,139.80x = 12,612.66 × 5,160.80
  4. Step 4: Simplify right side
    9,139.80x = 65,091,415.73
  5. Step 5: Solve for x
    x = 65,091,415.73/9,139.80
  6. Step 6: Final answer
    x = 7,121.75

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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.