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Finding the Fourth Proportional to 28,260, 38,998.80 and 15,684.84

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Solution

The fourth proportional to 28,260, 38,998.80 and 15,684.84 is: 21,645.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,260 : 38,998.80 = 15,684.84 : x
  2. Step 2: Convert to fraction form
    28,260/38,998.80 = 15,684.84/x
  3. Step 3: Cross multiply
    28,260x = 38,998.80 × 15,684.84
  4. Step 4: Simplify right side
    28,260x = 611,689,938.19
  5. Step 5: Solve for x
    x = 611,689,938.19/28,260
  6. Step 6: Final answer
    x = 21,645.08

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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.