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Finding the Fourth Proportional to 2,615.20, 3,929.20 and 1,967.20

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Solution

The fourth proportional to 2,615.20, 3,929.20 and 1,967.20 is: 2,955.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,615.20 : 3,929.20 = 1,967.20 : x
  2. Step 2: Convert to fraction form
    2,615.20/3,929.20 = 1,967.20/x
  3. Step 3: Cross multiply
    2,615.20x = 3,929.20 × 1,967.20
  4. Step 4: Simplify right side
    2,615.20x = 7,729,522.24
  5. Step 5: Solve for x
    x = 7,729,522.24/2,615.20
  6. Step 6: Final answer
    x = 2,955.61

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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.