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Finding the Fourth Proportional to 19,990.74, 29,980.87 and 5,946.99

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Solution

The fourth proportional to 19,990.74, 29,980.87 and 5,946.99 is: 8,918.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,990.74 : 29,980.87 = 5,946.99 : x
  2. Step 2: Convert to fraction form
    19,990.74/29,980.87 = 5,946.99/x
  3. Step 3: Cross multiply
    19,990.74x = 29,980.87 × 5,946.99
  4. Step 4: Simplify right side
    19,990.74x = 178,295,934.08
  5. Step 5: Solve for x
    x = 178,295,934.08/19,990.74
  6. Step 6: Final answer
    x = 8,918.93

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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.