Home / 21,033.60-29,030.40-15,388.80

Finding the Fourth Proportional to 21,033.60, 29,030.40 and 15,388.80

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Solution

The fourth proportional to 21,033.60, 29,030.40 and 15,388.80 is: 21,239.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,033.60 : 29,030.40 = 15,388.80 : x
  2. Step 2: Convert to fraction form
    21,033.60/29,030.40 = 15,388.80/x
  3. Step 3: Cross multiply
    21,033.60x = 29,030.40 × 15,388.80
  4. Step 4: Simplify right side
    21,033.60x = 446,743,019.52
  5. Step 5: Solve for x
    x = 446,743,019.52/21,033.60
  6. Step 6: Final answer
    x = 21,239.49

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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.