Home / 15,788.82-21,788.31-8,715.06

Finding the Fourth Proportional to 15,788.82, 21,788.31 and 8,715.06

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Solution

The fourth proportional to 15,788.82, 21,788.31 and 8,715.06 is: 12,026.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,788.82 : 21,788.31 = 8,715.06 : x
  2. Step 2: Convert to fraction form
    15,788.82/21,788.31 = 8,715.06/x
  3. Step 3: Cross multiply
    15,788.82x = 21,788.31 × 8,715.06
  4. Step 4: Simplify right side
    15,788.82x = 189,886,428.95
  5. Step 5: Solve for x
    x = 189,886,428.95/15,788.82
  6. Step 6: Final answer
    x = 12,026.64

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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.