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Finding the Fourth Proportional to 28,425, 39,228.72 and 15,679.33

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Solution

The fourth proportional to 28,425, 39,228.72 and 15,679.33 is: 21,638.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,425 : 39,228.72 = 15,679.33 : x
  2. Step 2: Convert to fraction form
    28,425/39,228.72 = 15,679.33/x
  3. Step 3: Cross multiply
    28,425x = 39,228.72 × 15,679.33
  4. Step 4: Simplify right side
    28,425x = 615,080,046.36
  5. Step 5: Solve for x
    x = 615,080,046.36/28,425
  6. Step 6: Final answer
    x = 21,638.70

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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.