Home / 21,005.12-28,986.80-11,445.41

Finding the Fourth Proportional to 21,005.12, 28,986.80 and 11,445.41

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Solution

The fourth proportional to 21,005.12, 28,986.80 and 11,445.41 is: 15,794.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.12 : 28,986.80 = 11,445.41 : x
  2. Step 2: Convert to fraction form
    21,005.12/28,986.80 = 11,445.41/x
  3. Step 3: Cross multiply
    21,005.12x = 28,986.80 × 11,445.41
  4. Step 4: Simplify right side
    21,005.12x = 331,765,810.59
  5. Step 5: Solve for x
    x = 331,765,810.59/21,005.12
  6. Step 6: Final answer
    x = 15,794.52

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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.