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Finding the Fourth Proportional to 15,789, 21,788.40 and 8,715.27

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Solution

The fourth proportional to 15,789, 21,788.40 and 8,715.27 is: 12,026.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789 : 21,788.40 = 8,715.27 : x
  2. Step 2: Convert to fraction form
    15,789/21,788.40 = 8,715.27/x
  3. Step 3: Cross multiply
    15,789x = 21,788.40 × 8,715.27
  4. Step 4: Simplify right side
    15,789x = 189,891,788.87
  5. Step 5: Solve for x
    x = 189,891,788.87/15,789
  6. Step 6: Final answer
    x = 12,026.84

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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.