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Finding the Fourth Proportional to 6,315.78, 8,714.88 and 3,521.28

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Solution

The fourth proportional to 6,315.78, 8,714.88 and 3,521.28 is: 4,858.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,315.78 : 8,714.88 = 3,521.28 : x
  2. Step 2: Convert to fraction form
    6,315.78/8,714.88 = 3,521.28/x
  3. Step 3: Cross multiply
    6,315.78x = 8,714.88 × 3,521.28
  4. Step 4: Simplify right side
    6,315.78x = 30,687,532.65
  5. Step 5: Solve for x
    x = 30,687,532.65/6,315.78
  6. Step 6: Final answer
    x = 4,858.87

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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.