Home / 21,207.84-31,811.55-12,890.15

Finding the Fourth Proportional to 21,207.84, 31,811.55 and 12,890.15

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Solution

The fourth proportional to 21,207.84, 31,811.55 and 12,890.15 is: 19,335.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,207.84 : 31,811.55 = 12,890.15 : x
  2. Step 2: Convert to fraction form
    21,207.84/31,811.55 = 12,890.15/x
  3. Step 3: Cross multiply
    21,207.84x = 31,811.55 × 12,890.15
  4. Step 4: Simplify right side
    21,207.84x = 410,055,651.23
  5. Step 5: Solve for x
    x = 410,055,651.23/21,207.84
  6. Step 6: Final answer
    x = 19,335.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.