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Finding the Fourth Proportional to 28,289, 39,040.08 and 15,713.72

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Solution

The fourth proportional to 28,289, 39,040.08 and 15,713.72 is: 21,685.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,289 : 39,040.08 = 15,713.72 : x
  2. Step 2: Convert to fraction form
    28,289/39,040.08 = 15,713.72/x
  3. Step 3: Cross multiply
    28,289x = 39,040.08 × 15,713.72
  4. Step 4: Simplify right side
    28,289x = 613,464,885.90
  5. Step 5: Solve for x
    x = 613,464,885.90/28,289
  6. Step 6: Final answer
    x = 21,685.63

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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.