Home / 21,830.61-30,125.88-12,139.68

Finding the Fourth Proportional to 21,830.61, 30,125.88 and 12,139.68

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Solution

The fourth proportional to 21,830.61, 30,125.88 and 12,139.68 is: 16,752.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,830.61 : 30,125.88 = 12,139.68 : x
  2. Step 2: Convert to fraction form
    21,830.61/30,125.88 = 12,139.68/x
  3. Step 3: Cross multiply
    21,830.61x = 30,125.88 × 12,139.68
  4. Step 4: Simplify right side
    21,830.61x = 365,718,542.92
  5. Step 5: Solve for x
    x = 365,718,542.92/21,830.61
  6. Step 6: Final answer
    x = 16,752.56

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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.