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Finding the Fourth Proportional to 19,980.54, 29,970.80 and 5,940.51

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Solution

The fourth proportional to 19,980.54, 29,970.80 and 5,940.51 is: 8,910.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,980.54 : 29,970.80 = 5,940.51 : x
  2. Step 2: Convert to fraction form
    19,980.54/29,970.80 = 5,940.51/x
  3. Step 3: Cross multiply
    19,980.54x = 29,970.80 × 5,940.51
  4. Step 4: Simplify right side
    19,980.54x = 178,041,687.25
  5. Step 5: Solve for x
    x = 178,041,687.25/19,980.54
  6. Step 6: Final answer
    x = 8,910.75

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Similar ratio
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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.