Home / 21,390.66-29,518.56-12,439.80

Finding the Fourth Proportional to 21,390.66, 29,518.56 and 12,439.80

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Solution

The fourth proportional to 21,390.66, 29,518.56 and 12,439.80 is: 17,166.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.66 : 29,518.56 = 12,439.80 : x
  2. Step 2: Convert to fraction form
    21,390.66/29,518.56 = 12,439.80/x
  3. Step 3: Cross multiply
    21,390.66x = 29,518.56 × 12,439.80
  4. Step 4: Simplify right side
    21,390.66x = 367,204,982.69
  5. Step 5: Solve for x
    x = 367,204,982.69/21,390.66
  6. Step 6: Final answer
    x = 17,166.60

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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.