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Finding the Fourth Proportional to 5,159.66, 7,120.31 and 2,921.31

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Solution

The fourth proportional to 5,159.66, 7,120.31 and 2,921.31 is: 4,031.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,159.66 : 7,120.31 = 2,921.31 : x
  2. Step 2: Convert to fraction form
    5,159.66/7,120.31 = 2,921.31/x
  3. Step 3: Cross multiply
    5,159.66x = 7,120.31 × 2,921.31
  4. Step 4: Simplify right side
    5,159.66x = 20,800,618.20
  5. Step 5: Solve for x
    x = 20,800,618.20/5,159.66
  6. Step 6: Final answer
    x = 4,031.40

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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.