Home / 2,902.72-4,005.12-2,117.20

Finding the Fourth Proportional to 2,902.72, 4,005.12 and 2,117.20

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Solution

The fourth proportional to 2,902.72, 4,005.12 and 2,117.20 is: 2,921.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,902.72 : 4,005.12 = 2,117.20 : x
  2. Step 2: Convert to fraction form
    2,902.72/4,005.12 = 2,117.20/x
  3. Step 3: Cross multiply
    2,902.72x = 4,005.12 × 2,117.20
  4. Step 4: Simplify right side
    2,902.72x = 8,479,640.06
  5. Step 5: Solve for x
    x = 8,479,640.06/2,902.72
  6. Step 6: Final answer
    x = 2,921.27

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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.