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Finding the Fourth Proportional to 12,858.51, 17,754.81 and 9,869.61

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Solution

The fourth proportional to 12,858.51, 17,754.81 and 9,869.61 is: 13,627.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,858.51 : 17,754.81 = 9,869.61 : x
  2. Step 2: Convert to fraction form
    12,858.51/17,754.81 = 9,869.61/x
  3. Step 3: Cross multiply
    12,858.51x = 17,754.81 × 9,869.61
  4. Step 4: Simplify right side
    12,858.51x = 175,233,050.32
  5. Step 5: Solve for x
    x = 175,233,050.32/12,858.51
  6. Step 6: Final answer
    x = 13,627.79

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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.