Home / 21,690.50-29,929.71-12,740.88

Finding the Fourth Proportional to 21,690.50, 29,929.71 and 12,740.88

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Solution

The fourth proportional to 21,690.50, 29,929.71 and 12,740.88 is: 17,580.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,690.50 : 29,929.71 = 12,740.88 : x
  2. Step 2: Convert to fraction form
    21,690.50/29,929.71 = 12,740.88/x
  3. Step 3: Cross multiply
    21,690.50x = 29,929.71 × 12,740.88
  4. Step 4: Simplify right side
    21,690.50x = 381,330,843.54
  5. Step 5: Solve for x
    x = 381,330,843.54/21,690.50
  6. Step 6: Final answer
    x = 17,580.55

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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.