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Finding the Fourth Proportional to 5,405.21, 7,459.20 and 2,921.21

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Solution

The fourth proportional to 5,405.21, 7,459.20 and 2,921.21 is: 4,031.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,405.21 : 7,459.20 = 2,921.21 : x
  2. Step 2: Convert to fraction form
    5,405.21/7,459.20 = 2,921.21/x
  3. Step 3: Cross multiply
    5,405.21x = 7,459.20 × 2,921.21
  4. Step 4: Simplify right side
    5,405.21x = 21,789,889.63
  5. Step 5: Solve for x
    x = 21,789,889.63/5,405.21
  6. Step 6: Final answer
    x = 4,031.28

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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.