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Finding the Fourth Proportional to 28,237, 38,967.24 and 15,661.78

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Solution

The fourth proportional to 28,237, 38,967.24 and 15,661.78 is: 21,613.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,237 : 38,967.24 = 15,661.78 : x
  2. Step 2: Convert to fraction form
    28,237/38,967.24 = 15,661.78/x
  3. Step 3: Cross multiply
    28,237x = 38,967.24 × 15,661.78
  4. Step 4: Simplify right side
    28,237x = 610,296,340.09
  5. Step 5: Solve for x
    x = 610,296,340.09/28,237
  6. Step 6: Final answer
    x = 21,613.36

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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.