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Finding the Fourth Proportional to 28,001.80, 38,629.84 and 18,439.12

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Solution

The fourth proportional to 28,001.80, 38,629.84 and 18,439.12 is: 25,437.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,001.80 : 38,629.84 = 18,439.12 : x
  2. Step 2: Convert to fraction form
    28,001.80/38,629.84 = 18,439.12/x
  3. Step 3: Cross multiply
    28,001.80x = 38,629.84 × 18,439.12
  4. Step 4: Simplify right side
    28,001.80x = 712,300,255.34
  5. Step 5: Solve for x
    x = 712,300,255.34/28,001.80
  6. Step 6: Final answer
    x = 25,437.66

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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.