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Finding the Fourth Proportional to 21,079.60, 29,089.80 and 12,128.80

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Solution

The fourth proportional to 21,079.60, 29,089.80 and 12,128.80 is: 16,737.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,079.60 : 29,089.80 = 12,128.80 : x
  2. Step 2: Convert to fraction form
    21,079.60/29,089.80 = 12,128.80/x
  3. Step 3: Cross multiply
    21,079.60x = 29,089.80 × 12,128.80
  4. Step 4: Simplify right side
    21,079.60x = 352,824,366.24
  5. Step 5: Solve for x
    x = 352,824,366.24/21,079.60
  6. Step 6: Final answer
    x = 16,737.72

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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.