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Finding the Fourth Proportional to 2,889.81, 3,988.13 and 2,180.40

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Solution

The fourth proportional to 2,889.81, 3,988.13 and 2,180.40 is: 3,009.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,889.81 : 3,988.13 = 2,180.40 : x
  2. Step 2: Convert to fraction form
    2,889.81/3,988.13 = 2,180.40/x
  3. Step 3: Cross multiply
    2,889.81x = 3,988.13 × 2,180.40
  4. Step 4: Simplify right side
    2,889.81x = 8,695,718.65
  5. Step 5: Solve for x
    x = 8,695,718.65/2,889.81
  6. Step 6: Final answer
    x = 3,009.10

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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.