Home / 21,820.18-30,115.74-12,867.16

Finding the Fourth Proportional to 21,820.18, 30,115.74 and 12,867.16

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Solution

The fourth proportional to 21,820.18, 30,115.74 and 12,867.16 is: 17,758.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,820.18 : 30,115.74 = 12,867.16 : x
  2. Step 2: Convert to fraction form
    21,820.18/30,115.74 = 12,867.16/x
  3. Step 3: Cross multiply
    21,820.18x = 30,115.74 × 12,867.16
  4. Step 4: Simplify right side
    21,820.18x = 387,504,045.10
  5. Step 5: Solve for x
    x = 387,504,045.10/21,820.18
  6. Step 6: Final answer
    x = 17,758.98

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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.