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Finding the Fourth Proportional to 28,288, 39,038.70 and 15,712.72

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Solution

The fourth proportional to 28,288, 39,038.70 and 15,712.72 is: 21,684.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,288 : 39,038.70 = 15,712.72 : x
  2. Step 2: Convert to fraction form
    28,288/39,038.70 = 15,712.72/x
  3. Step 3: Cross multiply
    28,288x = 39,038.70 × 15,712.72
  4. Step 4: Simplify right side
    28,288x = 613,404,162.26
  5. Step 5: Solve for x
    x = 613,404,162.26/28,288
  6. Step 6: Final answer
    x = 21,684.25

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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.