Home / 5,159.80-7,120.56-2,921.68

Finding the Fourth Proportional to 5,159.80, 7,120.56 and 2,921.68

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Solution

The fourth proportional to 5,159.80, 7,120.56 and 2,921.68 is: 4,031.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,159.80 : 7,120.56 = 2,921.68 : x
  2. Step 2: Convert to fraction form
    5,159.80/7,120.56 = 2,921.68/x
  3. Step 3: Cross multiply
    5,159.80x = 7,120.56 × 2,921.68
  4. Step 4: Simplify right side
    5,159.80x = 20,803,997.74
  5. Step 5: Solve for x
    x = 20,803,997.74/5,159.80
  6. Step 6: Final answer
    x = 4,031.94

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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.