Home / 21,370.90-29,491.41-12,990.10

Finding the Fourth Proportional to 21,370.90, 29,491.41 and 12,990.10

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Solution

The fourth proportional to 21,370.90, 29,491.41 and 12,990.10 is: 17,926.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,370.90 : 29,491.41 = 12,990.10 : x
  2. Step 2: Convert to fraction form
    21,370.90/29,491.41 = 12,990.10/x
  3. Step 3: Cross multiply
    21,370.90x = 29,491.41 × 12,990.10
  4. Step 4: Simplify right side
    21,370.90x = 383,096,365.04
  5. Step 5: Solve for x
    x = 383,096,365.04/21,370.90
  6. Step 6: Final answer
    x = 17,926.08

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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.