Home / 21,077.12-31,591.36-7,921.08

Finding the Fourth Proportional to 21,077.12, 31,591.36 and 7,921.08

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Solution

The fourth proportional to 21,077.12, 31,591.36 and 7,921.08 is: 11,872.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,077.12 : 31,591.36 = 7,921.08 : x
  2. Step 2: Convert to fraction form
    21,077.12/31,591.36 = 7,921.08/x
  3. Step 3: Cross multiply
    21,077.12x = 31,591.36 × 7,921.08
  4. Step 4: Simplify right side
    21,077.12x = 250,237,689.87
  5. Step 5: Solve for x
    x = 250,237,689.87/21,077.12
  6. Step 6: Final answer
    x = 11,872.48

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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.