Home / 15,788.49-21,788.19-8,715.38

Finding the Fourth Proportional to 15,788.49, 21,788.19 and 8,715.38

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Solution

The fourth proportional to 15,788.49, 21,788.19 and 8,715.38 is: 12,027.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,788.49 : 21,788.19 = 8,715.38 : x
  2. Step 2: Convert to fraction form
    15,788.49/21,788.19 = 8,715.38/x
  3. Step 3: Cross multiply
    15,788.49x = 21,788.19 × 8,715.38
  4. Step 4: Simplify right side
    15,788.49x = 189,892,246.42
  5. Step 5: Solve for x
    x = 189,892,246.42/15,788.49
  6. Step 6: Final answer
    x = 12,027.26

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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.