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Finding the Fourth Proportional to 18,705.85, 28,070.92 and 9,946.91

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Solution

The fourth proportional to 18,705.85, 28,070.92 and 9,946.91 is: 14,926.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,705.85 : 28,070.92 = 9,946.91 : x
  2. Step 2: Convert to fraction form
    18,705.85/28,070.92 = 9,946.91/x
  3. Step 3: Cross multiply
    18,705.85x = 28,070.92 × 9,946.91
  4. Step 4: Simplify right side
    18,705.85x = 279,218,997.47
  5. Step 5: Solve for x
    x = 279,218,997.47/18,705.85
  6. Step 6: Final answer
    x = 14,926.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.