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Finding the Fourth Proportional to 15,774.60, 21,758.04 and 12,790.56

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Solution

The fourth proportional to 15,774.60, 21,758.04 and 12,790.56 is: 17,642.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,774.60 : 21,758.04 = 12,790.56 : x
  2. Step 2: Convert to fraction form
    15,774.60/21,758.04 = 12,790.56/x
  3. Step 3: Cross multiply
    15,774.60x = 21,758.04 × 12,790.56
  4. Step 4: Simplify right side
    15,774.60x = 278,297,516.10
  5. Step 5: Solve for x
    x = 278,297,516.10/15,774.60
  6. Step 6: Final answer
    x = 17,642.13

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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.