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Finding the Fourth Proportional to 28,279, 39,026.10 and 15,703.48

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Solution

The fourth proportional to 28,279, 39,026.10 and 15,703.48 is: 21,671.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,279 : 39,026.10 = 15,703.48 : x
  2. Step 2: Convert to fraction form
    28,279/39,026.10 = 15,703.48/x
  3. Step 3: Cross multiply
    28,279x = 39,026.10 × 15,703.48
  4. Step 4: Simplify right side
    28,279x = 612,845,580.83
  5. Step 5: Solve for x
    x = 612,845,580.83/28,279
  6. Step 6: Final answer
    x = 21,671.40

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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.