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Finding the Fourth Proportional to 15,403.88, 21,258 and 8,689.76

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Solution

The fourth proportional to 15,403.88, 21,258 and 8,689.76 is: 11,992.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,403.88 : 21,258 = 8,689.76 : x
  2. Step 2: Convert to fraction form
    15,403.88/21,258 = 8,689.76/x
  3. Step 3: Cross multiply
    15,403.88x = 21,258 × 8,689.76
  4. Step 4: Simplify right side
    15,403.88x = 184,726,918.08
  5. Step 5: Solve for x
    x = 184,726,918.08/15,403.88
  6. Step 6: Final answer
    x = 11,992.23

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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.