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Finding the Fourth Proportional to 15,859.18, 21,884.56 and 8,785

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Solution

The fourth proportional to 15,859.18, 21,884.56 and 8,785 is: 12,122.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,859.18 : 21,884.56 = 8,785 : x
  2. Step 2: Convert to fraction form
    15,859.18/21,884.56 = 8,785/x
  3. Step 3: Cross multiply
    15,859.18x = 21,884.56 × 8,785
  4. Step 4: Simplify right side
    15,859.18x = 192,255,859.60
  5. Step 5: Solve for x
    x = 192,255,859.60/15,859.18
  6. Step 6: Final answer
    x = 12,122.69

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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.