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Finding the Fourth Proportional to 18,878.70, 28,321.45 and 7,779.32

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Solution

The fourth proportional to 18,878.70, 28,321.45 and 7,779.32 is: 11,670.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,878.70 : 28,321.45 = 7,779.32 : x
  2. Step 2: Convert to fraction form
    18,878.70/28,321.45 = 7,779.32/x
  3. Step 3: Cross multiply
    18,878.70x = 28,321.45 × 7,779.32
  4. Step 4: Simplify right side
    18,878.70x = 220,321,622.41
  5. Step 5: Solve for x
    x = 220,321,622.41/18,878.70
  6. Step 6: Final answer
    x = 11,670.38

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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.