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Finding the Fourth Proportional to 10,618.66, 15,989.72 and 7,864.87

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Solution

The fourth proportional to 10,618.66, 15,989.72 and 7,864.87 is: 11,843.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,618.66 : 15,989.72 = 7,864.87 : x
  2. Step 2: Convert to fraction form
    10,618.66/15,989.72 = 7,864.87/x
  3. Step 3: Cross multiply
    10,618.66x = 15,989.72 × 7,864.87
  4. Step 4: Simplify right side
    10,618.66x = 125,757,069.14
  5. Step 5: Solve for x
    x = 125,757,069.14/10,618.66
  6. Step 6: Final answer
    x = 11,843.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.