Home / 15,858.39-21,884.85-8,688.21

Finding the Fourth Proportional to 15,858.39, 21,884.85 and 8,688.21

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Solution

The fourth proportional to 15,858.39, 21,884.85 and 8,688.21 is: 11,989.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,858.39 : 21,884.85 = 8,688.21 : x
  2. Step 2: Convert to fraction form
    15,858.39/21,884.85 = 8,688.21/x
  3. Step 3: Cross multiply
    15,858.39x = 21,884.85 × 8,688.21
  4. Step 4: Simplify right side
    15,858.39x = 190,140,172.62
  5. Step 5: Solve for x
    x = 190,140,172.62/15,858.39
  6. Step 6: Final answer
    x = 11,989.88

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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.