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Finding the Fourth Proportional to 4,612.80, 6,919.20 and 4,256.40

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Solution

The fourth proportional to 4,612.80, 6,919.20 and 4,256.40 is: 6,384.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,612.80 : 6,919.20 = 4,256.40 : x
  2. Step 2: Convert to fraction form
    4,612.80/6,919.20 = 4,256.40/x
  3. Step 3: Cross multiply
    4,612.80x = 6,919.20 × 4,256.40
  4. Step 4: Simplify right side
    4,612.80x = 29,450,882.88
  5. Step 5: Solve for x
    x = 29,450,882.88/4,612.80
  6. Step 6: Final answer
    x = 6,384.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.