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Finding the Fourth Proportional to 15,725.88, 21,701.58 and 8,921.19

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Solution

The fourth proportional to 15,725.88, 21,701.58 and 8,921.19 is: 12,311.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,725.88 : 21,701.58 = 8,921.19 : x
  2. Step 2: Convert to fraction form
    15,725.88/21,701.58 = 8,921.19/x
  3. Step 3: Cross multiply
    15,725.88x = 21,701.58 × 8,921.19
  4. Step 4: Simplify right side
    15,725.88x = 193,603,918.48
  5. Step 5: Solve for x
    x = 193,603,918.48/15,725.88
  6. Step 6: Final answer
    x = 12,311.17

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Double scale
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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.