Home / 21,399.60-29,531.60-12,900.03

Finding the Fourth Proportional to 21,399.60, 29,531.60 and 12,900.03

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Solution

The fourth proportional to 21,399.60, 29,531.60 and 12,900.03 is: 17,802.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,399.60 : 29,531.60 = 12,900.03 : x
  2. Step 2: Convert to fraction form
    21,399.60/29,531.60 = 12,900.03/x
  3. Step 3: Cross multiply
    21,399.60x = 29,531.60 × 12,900.03
  4. Step 4: Simplify right side
    21,399.60x = 380,958,525.95
  5. Step 5: Solve for x
    x = 380,958,525.95/21,399.60
  6. Step 6: Final answer
    x = 17,802.13

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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.