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Finding the Fourth Proportional to 19,955.20, 29,947.20 and 11,180.80

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Solution

The fourth proportional to 19,955.20, 29,947.20 and 11,180.80 is: 16,779.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,955.20 : 29,947.20 = 11,180.80 : x
  2. Step 2: Convert to fraction form
    19,955.20/29,947.20 = 11,180.80/x
  3. Step 3: Cross multiply
    19,955.20x = 29,947.20 × 11,180.80
  4. Step 4: Simplify right side
    19,955.20x = 334,833,653.76
  5. Step 5: Solve for x
    x = 334,833,653.76/19,955.20
  6. Step 6: Final answer
    x = 16,779.27

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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.