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Finding the Fourth Proportional to 2,898.72, 3,999.60 and 2,113.20

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Solution

The fourth proportional to 2,898.72, 3,999.60 and 2,113.20 is: 2,915.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,898.72 : 3,999.60 = 2,113.20 : x
  2. Step 2: Convert to fraction form
    2,898.72/3,999.60 = 2,113.20/x
  3. Step 3: Cross multiply
    2,898.72x = 3,999.60 × 2,113.20
  4. Step 4: Simplify right side
    2,898.72x = 8,451,954.72
  5. Step 5: Solve for x
    x = 8,451,954.72/2,898.72
  6. Step 6: Final answer
    x = 2,915.75

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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.