Home / 21,208.34-31,812.30-12,890.66

Finding the Fourth Proportional to 21,208.34, 31,812.30 and 12,890.66

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Solution

The fourth proportional to 21,208.34, 31,812.30 and 12,890.66 is: 19,335.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,208.34 : 31,812.30 = 12,890.66 : x
  2. Step 2: Convert to fraction form
    21,208.34/31,812.30 = 12,890.66/x
  3. Step 3: Cross multiply
    21,208.34x = 31,812.30 × 12,890.66
  4. Step 4: Simplify right side
    21,208.34x = 410,081,384.06
  5. Step 5: Solve for x
    x = 410,081,384.06/21,208.34
  6. Step 6: Final answer
    x = 19,335.86

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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.