Home / 21,835.12-30,130.57-12,142.72

Finding the Fourth Proportional to 21,835.12, 30,130.57 and 12,142.72

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Solution

The fourth proportional to 21,835.12, 30,130.57 and 12,142.72 is: 16,755.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,835.12 : 30,130.57 = 12,142.72 : x
  2. Step 2: Convert to fraction form
    21,835.12/30,130.57 = 12,142.72/x
  3. Step 3: Cross multiply
    21,835.12x = 30,130.57 × 12,142.72
  4. Step 4: Simplify right side
    21,835.12x = 365,866,863.58
  5. Step 5: Solve for x
    x = 365,866,863.58/21,835.12
  6. Step 6: Final answer
    x = 16,755.89

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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.