Home / 9,120.75-12,581.78-6,131.45

Finding the Fourth Proportional to 9,120.75, 12,581.78 and 6,131.45

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Solution

The fourth proportional to 9,120.75, 12,581.78 and 6,131.45 is: 8,458.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,120.75 : 12,581.78 = 6,131.45 : x
  2. Step 2: Convert to fraction form
    9,120.75/12,581.78 = 6,131.45/x
  3. Step 3: Cross multiply
    9,120.75x = 12,581.78 × 6,131.45
  4. Step 4: Simplify right side
    9,120.75x = 77,144,461.41
  5. Step 5: Solve for x
    x = 77,144,461.41/9,120.75
  6. Step 6: Final answer
    x = 8,458.13

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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.