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Finding the Fourth Proportional to 15,788.66, 21,788.54 and 8,715.09

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Solution

The fourth proportional to 15,788.66, 21,788.54 and 8,715.09 is: 12,026.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,788.66 : 21,788.54 = 8,715.09 : x
  2. Step 2: Convert to fraction form
    15,788.66/21,788.54 = 8,715.09/x
  3. Step 3: Cross multiply
    15,788.66x = 21,788.54 × 8,715.09
  4. Step 4: Simplify right side
    15,788.66x = 189,889,043.49
  5. Step 5: Solve for x
    x = 189,889,043.49/15,788.66
  6. Step 6: Final answer
    x = 12,026.92

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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.