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Finding the Fourth Proportional to 15,706.88, 21,676.48 and 8,633.92

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Solution

The fourth proportional to 15,706.88, 21,676.48 and 8,633.92 is: 11,915.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,706.88 : 21,676.48 = 8,633.92 : x
  2. Step 2: Convert to fraction form
    15,706.88/21,676.48 = 8,633.92/x
  3. Step 3: Cross multiply
    15,706.88x = 21,676.48 × 8,633.92
  4. Step 4: Simplify right side
    15,706.88x = 187,152,994.20
  5. Step 5: Solve for x
    x = 187,152,994.20/15,706.88
  6. Step 6: Final answer
    x = 11,915.35

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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.