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Finding the Fourth Proportional to 5,115.50, 7,028.79 and 4,065.74

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Solution

The fourth proportional to 5,115.50, 7,028.79 and 4,065.74 is: 5,586.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,115.50 : 7,028.79 = 4,065.74 : x
  2. Step 2: Convert to fraction form
    5,115.50/7,028.79 = 4,065.74/x
  3. Step 3: Cross multiply
    5,115.50x = 7,028.79 × 4,065.74
  4. Step 4: Simplify right side
    5,115.50x = 28,577,232.65
  5. Step 5: Solve for x
    x = 28,577,232.65/5,115.50
  6. Step 6: Final answer
    x = 5,586.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.