Home / 21,122.31-29,156.07-12,173.39

Finding the Fourth Proportional to 21,122.31, 29,156.07 and 12,173.39

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Solution

The fourth proportional to 21,122.31, 29,156.07 and 12,173.39 is: 16,803.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,122.31 : 29,156.07 = 12,173.39 : x
  2. Step 2: Convert to fraction form
    21,122.31/29,156.07 = 12,173.39/x
  3. Step 3: Cross multiply
    21,122.31x = 29,156.07 × 12,173.39
  4. Step 4: Simplify right side
    21,122.31x = 354,928,065.20
  5. Step 5: Solve for x
    x = 354,928,065.20/21,122.31
  6. Step 6: Final answer
    x = 16,803.47

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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.