Home / 5,178.40-7,146.20-2,820.48

Finding the Fourth Proportional to 5,178.40, 7,146.20 and 2,820.48

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Solution

The fourth proportional to 5,178.40, 7,146.20 and 2,820.48 is: 3,892.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,178.40 : 7,146.20 = 2,820.48 : x
  2. Step 2: Convert to fraction form
    5,178.40/7,146.20 = 2,820.48/x
  3. Step 3: Cross multiply
    5,178.40x = 7,146.20 × 2,820.48
  4. Step 4: Simplify right side
    5,178.40x = 20,155,714.18
  5. Step 5: Solve for x
    x = 20,155,714.18/5,178.40
  6. Step 6: Final answer
    x = 3,892.27

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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.