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Finding the Fourth Proportional to 28,265.92, 39,009 and 15,690.58

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Solution

The fourth proportional to 28,265.92, 39,009 and 15,690.58 is: 21,654.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,265.92 : 39,009 = 15,690.58 : x
  2. Step 2: Convert to fraction form
    28,265.92/39,009 = 15,690.58/x
  3. Step 3: Cross multiply
    28,265.92x = 39,009 × 15,690.58
  4. Step 4: Simplify right side
    28,265.92x = 612,073,835.22
  5. Step 5: Solve for x
    x = 612,073,835.22/28,265.92
  6. Step 6: Final answer
    x = 21,654.13

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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.