Home / 21,871.44-30,182.30-12,311.28

Finding the Fourth Proportional to 21,871.44, 30,182.30 and 12,311.28

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Solution

The fourth proportional to 21,871.44, 30,182.30 and 12,311.28 is: 16,989.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,871.44 : 30,182.30 = 12,311.28 : x
  2. Step 2: Convert to fraction form
    21,871.44/30,182.30 = 12,311.28/x
  3. Step 3: Cross multiply
    21,871.44x = 30,182.30 × 12,311.28
  4. Step 4: Simplify right side
    21,871.44x = 371,582,746.34
  5. Step 5: Solve for x
    x = 371,582,746.34/21,871.44
  6. Step 6: Final answer
    x = 16,989.40

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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.