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Finding the Fourth Proportional to 12,895.52, 17,785.68 and 8,645.12

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Solution

The fourth proportional to 12,895.52, 17,785.68 and 8,645.12 is: 11,923.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,895.52 : 17,785.68 = 8,645.12 : x
  2. Step 2: Convert to fraction form
    12,895.52/17,785.68 = 8,645.12/x
  3. Step 3: Cross multiply
    12,895.52x = 17,785.68 × 8,645.12
  4. Step 4: Simplify right side
    12,895.52x = 153,759,337.88
  5. Step 5: Solve for x
    x = 153,759,337.88/12,895.52
  6. Step 6: Final answer
    x = 11,923.47

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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.