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Finding the Fourth Proportional to 21,089.58, 29,103.65 and 12,136.92

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Solution

The fourth proportional to 21,089.58, 29,103.65 and 12,136.92 is: 16,748.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,089.58 : 29,103.65 = 12,136.92 : x
  2. Step 2: Convert to fraction form
    21,089.58/29,103.65 = 12,136.92/x
  3. Step 3: Cross multiply
    21,089.58x = 29,103.65 × 12,136.92
  4. Step 4: Simplify right side
    21,089.58x = 353,228,611.07
  5. Step 5: Solve for x
    x = 353,228,611.07/21,089.58
  6. Step 6: Final answer
    x = 16,748.96

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Half scale
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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.