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Finding the Fourth Proportional to 2,147.50, 3,220.65 and 760.65

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Solution

The fourth proportional to 2,147.50, 3,220.65 and 760.65 is: 1,140.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,147.50 : 3,220.65 = 760.65 : x
  2. Step 2: Convert to fraction form
    2,147.50/3,220.65 = 760.65/x
  3. Step 3: Cross multiply
    2,147.50x = 3,220.65 × 760.65
  4. Step 4: Simplify right side
    2,147.50x = 2,449,802.35
  5. Step 5: Solve for x
    x = 2,449,802.35/2,147.50
  6. Step 6: Final answer
    x = 1,140.77

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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.