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Finding the Fourth Proportional to 15,759.73, 21,747.40 and 8,686.15

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Solution

The fourth proportional to 15,759.73, 21,747.40 and 8,686.15 is: 11,986.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,759.73 : 21,747.40 = 8,686.15 : x
  2. Step 2: Convert to fraction form
    15,759.73/21,747.40 = 8,686.15/x
  3. Step 3: Cross multiply
    15,759.73x = 21,747.40 × 8,686.15
  4. Step 4: Simplify right side
    15,759.73x = 188,901,178.51
  5. Step 5: Solve for x
    x = 188,901,178.51/15,759.73
  6. Step 6: Final answer
    x = 11,986.32

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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.